methylxanthineWiktionary 原文英美构词拆解methylmethyl词干xanthinexanthine词干词源说明From methyl + xanthine.释义名词noun1(organic chemistry) Any of a group of compounds, such as caffeine, formed through the methylation of xanthines.同族词派生词 2isobutylmethylxanthine·methylxanthinic