Structure of a monocarboxylic acid derivative of vitamin B12

Abstract

One particular monocarboxrlic add derived from cyanocobalamin can be grown in very large crystals on which both X-ray and neutron dlffraaion measurements have been made. Calculations lead to the placing of some 205 atoms in the crystal asymmetric unit. Including 98 hrdrogen atoms. and thus to the detailed definition ofthe chemicai aruaure of the molecuie