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Molecular Formula C43H66N12O12S2
Molecular Weight 1007.2
Monoisotopic Mass 1006.43645793
Polar Area 450
Complexity 1870
XLogP -2.6
Heavy Atom Count 69
Hydrogen Bond Donor Count 12
Hydrogen Bond Acceptor Count 15
Rotatable Bond Count 17
Physical Appearance Fine White Lyophilized Powder
Stability Lyophilized protein is to be stored at -20°C. It is recommended to aliquot the reconstituted (dissolved) protein into several discrete vials in order to avoid repeated freezing and thawing. Reconstituted protein can be stored at 4°C
PubChem LCSS Oxytocin Laboratory Chemical Safety Summary


CID 439302
CAS 50-56-6
InChI InChI=1S/C43H66N12O12S2/c1-5-22(4)35-42(66)49-26(12-13-32(45)57)38(62)51-29(17-33(46)58)39(63)53-30(20-69-68-19-25(44)36(60)50-28(40(64)54-35)16-23-8-10-24(56)11-9-23)43(67)55-14-6-7-31(55)41(65)52-27(15-21(2)3)37(61)48-18-34(47)59/h8-11, 21-22, 25-31, 35, 56H, 5-7, 12-20, 44H2, 1-4H3, (H2, 45, 57)(H2, 46, 58)(H2, 47, 59)(H, 48, 61)(H, 49, 66)(H, 50, 60)(H, 51, 62)(H, 52, 65)(H, 53, 63)(H, 54, 64)/t22-, 25-, 26-, 27-, 28-, 29-, 30-, 31-, 35-/m0/s1
Isomeric SMILES CC[C@H](C)[C@H]1C(=O)N[C@H](C(=O)N[C@H](C(=O)N[C@@H](CSSC[C@@H](C(=O)N[C@H](C(=O)N1)CC2=CC=C(C=C2)O)N)C(=O)N3CCC[C@H]3C(=O)N[C@@H](CC(C)C)C(=O)NCC(=O)N)CC(=O)N)CCC(=O)N
IUPAC Name (2S)-1-[(4R, 7S, 10S, 13S, 16S, 19R)-19-amino-7-(2-amino-2-oxoethyl)-10-(3-amino-3-oxopropyl)-13-[(2S)-butan-2-yl]-16-[(4-hydroxyphenyl)methyl]-6, 9, 12, 15, 18-pentaoxo-1, 2-dithia-5, 8, 11, 14, 17-pentazacycloicosane-4-carbonyl]-N-[(2S)-1-[(2-amino-2-oxoethyl)amino]-4-methyl-1-oxopentan-2-yl]pyrrolidine-2-carboxamide

2D Structure

Generated by Extreme Peptide with Open Babel, version 2.3.1, (accessed June 28, 2022)

Oxytocin 2D molecular structure vector generated with oBabel


Oxytocin is a synthetic analogue of a naturally occurring peptide bearing the same name that is typically produced in hypothalamus nerve cells and then stored in the posterior pituitary gland1. Oxytocin is a neuromodulating agent in the brain with significant action throughout the process of mammalian sexual reproduction2. From stimulating sexual attraction3 to intensifying sexual climax4 to diminishing pain sensitivity and relaxing a mother’s muscles during childbirth5, oxytocin is present and integral to all stages of procreation, earning it the colloquial name ‘The Love Hormone’.

Interpersonal Connection

Oxytocin has been extensively researched as an agent for initiating a state of calm, a sense of trust, and a more relaxed mode for interpersonal connection and social interaction6. Animal subjects have been observed to act more boldly and with reduced anxiety following administration of oxytocin, as opposed to the evolutionary urge to keep others at a distance7. Complementary to the emotional state of calm, oxytocin has been shown to release muscle tension, to slow heart rate, and to reduce blood pressure8.

Physical Effects

Oxytocin has also been observed to be a positive effector of quick wound healing9 as a result of fibroblast recruitment and an inhibition of the inflammatory response10. Research in animal subjects has demonstrated that oxytocin also has a peripheral role in stimulating growth hormone release11 and in inducing digestion, leading to enhanced metabolic efficiency.

Oxytocin’s action in enhancing libido, reducing social anxiety, and allowing for sensations of romantic attachment make it attractive as a potential remedy for subjects receiving necessary treatment that may inhibit these functions through side effects.


Oxytocin Acetate, 3-Isoleucine-8-leucine vasopressin; Alpha-hypophamine; Atonin O; Di-sipidin; Endopituitrina; Hyphotocin; Intertocine S; Perlacton; Pitocin; Piton S; Presoxin;Synpitan;

Peer-Reviewed Sources:

  1. Brownstein, M. J., Russell, J. T., & Gainer, H. (1980). Synthesis, transport, and release of posterior pituitary hormones. Science, 207(4429), 373-378. ↩︎
  2. Stoop, R. (2012). Neuromodulation by oxytocin and vasopressin. Neuron 76(1), 142-159. ↩︎
  3. Smith, A. S., Ågmo, A., Birnie, A. K., & French, J. A. (2010). Manipulation of the oxytocin system alters social behavior and attraction in pair-bonding primates, Callithrix penicillata. Hormones and behavior, 57(2), 255-262. ↩︎
  4. Thornhill, R., Gangestad, S. W., & Comer, R. (1995). Human female orgasm and mate fluctuating asymmetry. Animal Behaviour, 50(6), 1601-1615. ↩︎
  5. Newton, N. (1978). The role of the oxytocin reflexes in three interpersonal reproductive acts: coitus, birth and breastfeeding. Clinical psychoneuroendocrinology in reproduction, 22, 411-418. ↩︎
  6. Turner, R. A., Altemus, M., Enos, T., Cooper, B., & McGuinness, T. (1999). Preliminary research on plasma oxytocin in normal cycling women: investigating emotion and interpersonal distress. Psychiatry, 62(2), 97-113. ↩︎
  7. Guastella, A. J., Mitchell, P. B., & Dadds, M. R. (2008). Oxytocin increases gaze to the eye region of human faces. Biological psychiatry, 63(1), 3-5. ↩︎
  8. Petersson, M., Alster, P., Lundeberg, T., & Uvnäs-Moberg, K. (1996). Oxytocin causes a long-term decrease of blood pressure in female and male rats.Physiology & behavior, 60(5), 1311-1315. ↩︎
  9. Gouin, J. P., Carter, C. S., Pournajafi-Nazarloo, H., Glaser, R., Malarkey, W. B., Loving, T. J., & Kiecolt-Glaser, J. K. (2010). Marital behavior, oxytocin, vasopressin, and wound healing. Psychoneuroendocrinology, 35(7), 1082-1090. ↩︎
  10. Petersson, M., Wiberg, U., Lundeberg, T., & Uvnäs-Moberg, K. (2001). Oxytocin decreases carrageenan induced inflammation in rats. Peptides, 22(9), 1479-1484. ↩︎
  11. Alexander, D. P., Britton, H. G., Forsling, M. L., & Ratcliffe, J. G. (1974). Pituitary and plasma concentrations of adrenocorticotrophin, growth hormone, vasopressin and oxytocin in fetal and maternal sheep during the latter half of gestation and the response to haemorrhage. Neonatology, 24(3-4), 206-219. ↩︎

All literature, information, and data, provided on this website are for informational and educational purposes only.

Accurate research is our priority.

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