5-(2-Hydroxyphenyl)-1-(3-mercapto-1-oxopropyl)proline 75664-11-8 Proline, 5-(2-hydroxyphenyl)-1-(3-mercapto-1-oxopropyl)- alpha-5-(2-Hydroxyphenyl)-1-(3-mercaptopropanoyl)-2-pyrrolidinecarboxylic acid