H 1631 (OTTO) 1-(2-Hydroxyethyl)piperidine, 99% Cas 3040-44-6 - used as the base quencher to determine the efficiency of the decomposition of photoacid generators.Counter-ion used for investigations of skin permeation of flurbiprofen. H 1631 (OTTO) 1-(2-Hydroxyethyl)piperidine, 99% Cas 3040-44-6 - used for enantioselective synthesis.