3',6'-Dihydroxy-5-isothiocyanatospiro(isobenzofuran-1(3H),9'-(9H)xanthene)-3-one hydrochloride 3326-32-7 63469-13-6 EINECS 264-260-9 Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-dihydroxy-5-isothiocyanato-, hydrochloride