2.1.1.83	S-adenosyl-L-methionine + 3',4',5-trihydroxy-3,7-dimethoxyflavone	trivial name 3,7-dimethylquercetin, enzyme does not act on flavones, dihydroflavonols or their glucosides, involved with EC 2.1.1.76 and 2.1.1.82 in the methylation of quercitin to 3,7,4'-trimethylquercitin