Patent ID: 7960416

Claim:
An emulsion composition comprising (1) a compound of the formula: wherein R represents an optionally substituted aliphatic hydrocarbon group, an optionally substituted aromatic hydrocarbon group, an optionally substituted heterocyclic group, a group represented by the formula: OR 1 wherein R 1 represents a hydrogen atom or an optionally substituted aliphatic hydrocarbon group, or a group represented by the formula: wherein R 1b and R 1c are each independently a hydrogen atom or an optionally substituted aliphatic hydrocarbon group, R 0 represents a hydrogen atom or an optionally substituted aliphatic hydrocarbon group, or taken together, R and R 0 represent a bond, wherein n is an integer of 1 to 4, ring A 1 is a cycloalkene optionally substituted by 1 to 4 substituents selected from the group consisting of (i) an aliphatic hydrocarbon group optionally having substituents, (ii) an aromatic hydrocarbon group optionally having substituents, (iii) a group represented by the formula: OR 1 wherein R 1 represents a hydrogen atom or an aliphatic hydrocarbon group optionally having substituents, and (iv) a halogen atom, Ar represents an optionally substituted aromatic hydrocarbon group, a salt thereof or a prodrug therefor, (2) an anionic synthetic phospholipid in a proportion of about 0.1 to about 0.2% weight per total volume relative to the composition in total, and (3) a naturally-occurring phospholipid in a proportion of about 0.1 to about 10% weight per total volume relative to the composition in total, wherein the emulsion has a pH of not more than about 6.