2,5,5-Trimethyl-2-(2-oxo-2-(1-piperidinyl)ethyl)-4-thiazolidinecarboxylic acid 4-Carboxy-2,5,5-trimethylthiazolidine-2-acetopiperidide 4-Thiazolidinecarboxylic acid, 2,5,5-trimethyl-2-(2-oxo-2-(1-piperidinyl)ethyl)- 85486-58-4