Oxytocin parallel dimer TFA is the disulfide-bridged homo peptide dimer. Oxytocin dimer has oxytocin and vasopressin-like activity with less toxic than oxytocin.
The parallel and antiparallel homo/hetero bis-cystine dimers of oxytocin and deamino-oxytocin show biological activities ranged from 0.2% to 6% that of oxytocin[1].
Oxytocin dimer (iv; single dose) shows acute toxicity (LD50=43 mg/kg) is less than that of oxytocin (LD50=25 mg/kg) in rats[2].
References:
[1]. Chen L, et al. Syntheses and biological activities of parallel and antiparallel homo and hetero bis-cystine dimers of oxytocin and deamino-oxytocin. Pept Res. 1996;9(3):114-121.
[2]. Berde B, et al. Some pharmacological properties of oxytocin-dimers (α+ β)[J]. Experientia, 1971, 27: 1304-1305.