Patent ID: 8916197

Claim:
A bone marrow-directing drug delivery material comprising at least one fine particle having a diameter of 20 to 500 nm, wherein the fine particle further comprises: a first amphipathic compound having the following structure: MOOCR 3 —CO—HNCH(COOR 4 )CH 2 CH 2 COOR 4 , wherein M is a hydrogen atom or a monovalent cation, R 3 is —CH 2 CH 2 — and R 4 is a C 10 -C 22 alkyl group; and a second amphipathic compound comprising 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[monomethoxy poly(ethylene glycol) (PEG-DSPE).