甲基硫酸[3-氰基-6-羥基-4-甲基-2-羰基-(2H)-吡啶-1-丙基](三甲基)銨 [3-cyano-6-hydroxy-4-methyl-2-oxo-(2H)-pyridine-1-propyl](trimethyl)ammoniummethylsulphate

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