BRANCHED POLYETHYLENE GLYCOL MODIFIED LIPID HAVING TWO POLYETHYLENE GLYCOL CHAINS HAVING DIFFERENT MOLECULAR WEIGHT AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a branched polyethylene glycol modified lipid having two polyethylene glycol chains having different molecular weight increasing a hydrated layer on a liposome surface and easily being industrially manufactured and a manufacturing method therefor.SOLUTION: There is provided a branched polyethylene glycol modified lipid having two polyethylene glycol chins having different molecular weight represented by the formula (1), where each symbol are as defined in the specification.