Patent ID: 8557875

Claim:
A gene transfer agent composition comprising a compound represented by any one of the following formulae DL-G1 to DL-G4: R 1 R 2 NX(XH 2 ) 2 ; DL-G1: R 1 R 2 NX(X(XH 2 ) 2 ) 2 ; DL-G2: R 1 R 2 NX(X(X(XH 2 ) 2 ) 2 ) 2 ; DL-G3: and R 1 R 2 NX(X(X(X(XH 2 ) 2 ) 2 ) 2 ) 2 , DL-G4: where X represents —CH 2 CH 2 CONHCH 2 CH 2 N—, wherein: R 1 represents an unsaturated long-chain aliphatic group; and R 2 represents an unsaturated long-chain aliphatic group or a saturated long-chain aliphatic group in the formulae.