1,2,4-Triazolidine-1,3-dicarboxylic acid, 3-benzoyl-5-phenyl-4-(phenylmethyl)-, diethyl ester 1,2,4-Triazolidine-2,4-dicarboxylic acid, 2-benzoyl-1-benzyl-5-phenyl-, diethyl ester 102433-77-2 3-Benzoyl-4-benzyl-5-phenyl-1,2-dicarbethoxy-1,2,4-triazolidine