MODRES 2A9W CXM A 1 MET N-(DIHYDROXYMETHYL)-L-METHIONINE MODRES 2A9W CXM B 1 MET N-(DIHYDROXYMETHYL)-L-METHIONINE MODRES 2A9W CXM C 1 MET N-(DIHYDROXYMETHYL)-L-METHIONINE MODRES 2A9W CXM D 1 MET N-(DIHYDROXYMETHYL)-L-METHIONINE