| abstract |
The invention can provide a gelling agent which can form a very small amount of colloid in an acidic to alkaline liquid range, and has a high environment. A biocompatible and biodegradable colloid. The present invention is a compound of the formula (1) □ (wherein R1 represents an aliphatic group having 9 to 23 carbon atoms, R2 represents a hydrogen atom, or a hydrocarbon having 1 or 2 carbon atoms is a branched chain having 1 to 4 carbon atoms. An alkyl group, R3 represents a -(CH2)nX group, n represents a number from 1 to 4, X represents an amine group, a fluorenyl group, a -CONH2 group, or a five-membered ring or a six-membered ring having from 1 to 3 nitrogen atoms or A lipid peptide characterized by a condensed heterocyclic ring composed of a five-membered ring and a six-membered ring, or a pharmaceutically acceptable salt thereof. |