2-Thiopheneglycolic acid, alpha-phenyl-, 4-(diethylamino)-2-butynyl ester, hydrochloride 3512-32-1 4-Diethylamino-2-butynyl phenyl(2-thienyl)glycolate hydrochloride NSC 263545 alpha-Phenyl-2-thiopheneglycolic acid 4-(diethylamino)-2-butynyl ester hydrochloride