LH-RH receptor antagonists

PCT No. PCT/JP96/01140 Sec. 371 Date Jun. 6, 1996 Sec. 102(e) Date Jun. 6, 1996 PCT Filed Apr. 25, 1996 PCT Pub. No. WO96/34012 PCT Pub. Date Oct. 31, 1996The LH-RH receptor antagonists containing cyclic pentapeptides or salts thereof and novel cyclic pentapeptide or salts thereof are provided. The LH-RH receptor antagonists of the present invention are effective as medicines for preventing and curing sex hormone-dependent cancers (e.g., prostatic cancer, uterine cancer, mammary cancer, pituitary tumor, etc.), prostatomegaly, endometriosis, hysteromyoma, puberty precox, amenorrheal syndromes, multilocular ovarian syndromes, comedo, etc. and are also effective as pregnancy controlling agents (e.g., contraceptives, etc.) and menstrual cycle controlling agents.Moreover, these are also useful in the livestock industry for the control of the estrus of animals and also for the improvement in the quality of meat and for the control of the growth of animals, as well as in the marine products industry as spawning promoters for fishes.