2-Methyl-6-hydroxyfluoran 6-Hydroxy-2-methylfluoran 6-Hydroxy-2-methylxanthen-9-spiro-1'-isobenzofuran-3'-one 83469-76-5 Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 6'-hydroxy-2'-methyl-