气相SO3磺化法合成染料中间体3-乙氨基-4-甲基苯磺酸
기상SO3광화법합성염료중간체3-을안기-4-갑기분광산
Synthesis of dye intermediate 3-N-ethyl-4-methylbenzenesulfonic acid by gaseous sulfur trioxide sulfonation method
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