151890-76-5 3',6'-Dihydroxy-3-oxospiro-(isobenzofuran-1(3H),9'-9H-xanthene)-6-carboxylic acid 2-(mercaptoacetyl)hydrazide Doixc-mah Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-6-carboxylic acid, 3',6'-dihydroxy-3-oxo-, 2-(mercaptoacetyl)hydrazide