Patent ID: 8916682

Claim:
A hydrogel comprising: a lipid peptide represented by Formula (1) or a pharmaceutically usable salt thereof: where R 1 represents an aliphatic group having 9 to 23 carbon atoms; R 2 , R 3 , and R 4 independently represent a hydrogen atom, an alkyl group having 1 to 7 carbon atom(s) which optionally has a branched chain having 1 to 3 carbon atom(s), a phenylmethyl group, a phenylethyl group, or a —(CH 2 ) n —X group, and R 5 represents a —(CH 2 ) n —X group; n represents a number from 1 to 4; X represents: a 5-membered ring, a 6-membered ring, or a fused heterocyclic ring composed of a 5-membered ring and a 6-membered ring, which optionally have 1 to 3 nitrogen atom(s); and m represents 1 or 2, and an aqueous solution or an alcohol aqueous solution.