Direct alkoxylation of aromatic compounds is virtually unknown. 事實(shí)上還不知道芳香族化合物的直接烷氧基化的方法。
They found that it was composed of various aromatic compounds and sulfides in addition to large quantities of carbon. 他們發(fā)現原來(lái)它的組成除了大量的碳，還有各類(lèi)芳香族化合物和硫化物。
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