To provide a medicinal composition that has the steroid C17,20lyase inhibiting activity, and is useful for preventing and treating prostatism or tumor such as breast cancer.
The steroid C17,20lyase inhibitor includes a compound represented by the formula (I) (wherein A1 is an aromatic hydrocarbon group which may bear a substituent or a heterocyclic group which may bear a substituent, one of A2 or A3 is H atom, a halogen atom, a 1-4 C aliphatic hydrocarbon group which may bear a substituent or a carboxy group which may be esterified, the other is an aromatic hydrocarbon group which may bear a substituent or a heterocyclic group which may bear a substituent wherein at least one of A1, A2, and A3 is 3-pyridyl group which may bear a substituent) or salt or prodrug thereof.
NARA TEI
HASHIGUCHI SHOHEI
TASAKA AKIHIRO
KUSAKA MASAMI
YAMAOKA MASUO
KAKO TOSHIHIRO
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