[C:1]1([CH:7]2[S:11]C(=N)N[C:8]2=[O:13])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[OH-:14].[Ba+2].[OH-]>C(O)C>[SH:11][CH:7]([C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)[C:8]([OH:13])=[O:14]Hydrolysis of 142 g of 5-phenyl-2-imino-4-thiazolidinone with barium hydroxide in 20% aqueous ethanol gave 55 g of α-mercaptophenylacetic acid (70% yield).
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