dimethyl ester of 9-dicarboxymethylxanthene

10-(methoxycarbonyl)dibenz[b,f]oxepin

3-methoxy-3-oxo-2-(9H-xanthen-9-ylidene)propanoic acid

ethyl 2-cyano-2-(9H-xanthen-9-yl)acetate

9-(1'-ethoxycarbonyl-2'-oxo-3'-oxapent-1'-yl)xanthene