1,2,5,6-Tetrahydro-1-ethyl-4-hydroxy-3-pyridinecarboxylic acid ethyl ester 1-Aethyl-4-hydroxy-1,2,5,6-tetrahydronicotinsaeureaethylester [German] 1-Ethyl-4-hydroxy-1,2,5,6-tetrahydronicotinic acid ethyl ester 3-Pyridinecarboxylic acid, 1,2,5,6-tetrahydro-1-ethyl-4-hydroxy-, ethyl ester 37673-69-1