prov:value
| - where B is a protecting group selected from the group of alkyloxy, substituted alkyloxy, or aryloxy carbonyls; R is the side chain of an amino acid, such as H, CH3, etc.; X is a spacer group selected from the group of alkylene, substituted alkylene, arylene, cycloalkylene or substituted cycloalkylene; and A is a protecting group selected from the group of alkyl or substituted alkyl, esters, or thi
|