nucleoside diphosphate 292.983 293.08240 C5H11O10P2R CHEBI:13401 CHEBI:13662 CHEBI:14675 CHEBI:16862 CHEBI:25606 CHEBI:7428 CHEBI:7652 KEGG:C00454 NDP Nucleoside diphosphate O[C@H]1[C@H]([*])O[C@H](COP(O)(=O)OP(O)(O)=O)[C@H]1O chebi_ontology nucleoside diphosphates nucleoside phosphate