abstract |
Provided is a compound represented by the formula (I): wherein R 1 represents R 5 =N- (R 5 represents a saccharide residue) or (R 4 represents a mono- or polyethylene glycol residue); each of R 2 and R 3 , whether identical or not, represents a hydrocarbon group having 1-30 carbon atoms; and n represents 0 or 1. |