PTH-DL-SERINE, PHENYLTHIOHYDANTOIN SERINE, 3-Phenyl-5-hydroxymethyl-thiohydantoin, 5-Hydroxymethyl-3-phenyl-2-thioxo-imidazolidin-4-on, PTH-DL-Serine Phenylthiohydantoin-DL-serine, serine 3-phenylthiohydantoin, D,L-serine N-phenylthiohydantoin, 5-hydroxymethyl-3-phenyl-2-thioxo-imidazolidin-4-one