PTH-PROLINE

PTH-L-PROLINE

PHENYLTHIOHYDANTOIN L-PROLINE

hexahydro-2-phenyl-3-thioxo-1H-pyrrolo[1,2-c]imidazol-1-one

2-phenyl-3-thioxo-5,6,7,7a-tetrahydropyrrolo[2,1-e]imidazol-1-one

2-phenyl-3-sulfanylidene-5,6,7,7a-tetrahydropyrrolo[2,1-e]imidazol-1-one