Synthetic analog of prostaglandin F2α, q.v. Synthesis: C. Gandolfi et al., DE 2539116; eidem, US 4035415 (1976, 1977 both to Carlo Erba). Efficacy in bovine estrus synchronization: E. Schilling et al., Theriogenology 18, 413 (1982). Treatment of infertility in cows caused by persistent corpus luteum: G. Maffeo et al., Prostaglandins 25, 541 (1983). Efficacy in increasing calving rate in beef heifers and cows: E. R. doValle et al., J. Anim. Sci. 75, 897 (1997).