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. 2020 May 21;25(10):2405. doi: 10.3390/molecules25102405

Scheme 1.

Scheme 1

Chemical transformations of 3,4-dimethoxy-1-methyl-9H-xanthen-9-one (1) and 3,4,6-trimethoxy-1-methyl-9H-xanthen-9-one (2).