H 1521 (OTTO) Hantzsch ester, 97% Cas 1149-23-1 - used to study the mechanism of electrochemical oxidation of DTP in ethanol/water solutions on a glassy carbon electrode. H 1521 (OTTO) Hantzsch ester, 97% Cas 1149-23-1 - used as a hydrogen source in organocatalytic reductive amination and conjugate reduction.