Fmoc-Pro-Pro-OH (CAS NO.129223-22-9) is also named as 1-[(9H-fluoren-9-ylmethoxy)carbonyl]-L-prolyl-L-proline ; 1-{1-[(9H-Fluoren-9-ylmethoxy)carbonyl]-L-prolyl}-L-prolin ; L-proline, 1-[(9H-fluoren-9-ylmethoxy)carbonyl]-L-prolyl- .