title: Synthesis of some 2'-(3-oxopregn-4-en-20-yl)oxazolidines and -thiazolidines.
mesh_terms: D004353:Drug Evaluation, Preclinical; D010080:Oxazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D013844:Thiazoles / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D010080:Oxazoles; D013844:Thiazoles