2-Chloromethyl-3,4-dimethoxypyridine hydrochloride2-Chloromethyl-3,4-dimethoxypyridine hydrochloride2-(Chloromethyl)-3,4-dimethoxypyridinium hydrochloride2-(氯甲基)-3,4-二甲氧基吡啶 盐酸盐2-(Chloromethyl)-3,4-dimethoxypyridine hydrochloride2-(Chloromethyl)-3,4-dimethoxypyridine hydrochloride