| 4-hydroxy-1-methyl-3-piperidinecarboxylic aci ethyl ester |
| 1-methyl-4-hydroxy-nipecotinsaeureaethylester |
| 1-methyl-4-hydroxynipecotinic acid ethyl ester |
| 4-hydroxy-1-methyl-3-piperidinecarboxylic acid ethyl ester |
| 4-hydroxy-1-methyl-3-piperidinecarboxylic aciethyl ester |
