1-[2-[(4-Carboxy-3-hydroxyphenyl)carbamoyl]ethyl]-1-methylpiperidiniumiodide, methyl ester (7CI); Piperidinium,1-[3-[[3-hydroxy-4-(methoxycarbonyl)phenyl]amino]-3-oxopropyl]-1-methyl-,iodide (9CI)
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