117241-40-4 3-((5-Oxo-2-pyrrolidinyl)carbonyl)-4-thiazolidinecarboxylic acid 3-Pyroglutamylthiazolidine-4-carboxylic acid 4-Thiazolidinecarboxylic acid, 3-((5-oxo-2-pyrrolidinyl)carbonyl)- Pgt-1A Pidotimod