3-Piperidinecarboxylic acid, 4-hydroxy-1-methyl-, methyl ester, hydrobromide, cis- Nipecotic acid, 4-hydroxy-1-methyl-, methyl ester, hydrobromide, cis- QU1980000 cis-4-Hydroxy-1-methylnipecotic acid methyl ester hydrobromide cis-N-Methyl-3-carbomethoxy-4-hydroxypiperidine hydrobromide