| abstract |
An emulsion composition containing a compound represented by the formula: <CHEM> wherein R is an aliphatic hydrocarbon group optionally having substituents, an aromatic hydrocarbon group optionally having substituents, a heterocyclic group optionally having substituents, a group represented by the formula: -OR<1> (wherein R<1> is a hydrogen atom or an aliphatic hydrocarbon group optionally having substituents) or a group represented by the formula: <CHEM> wherein R<1b> is a hydrogen atom or an aliphatic hydrocarbon group optionally having substituents, R<1c> is the same as or different from R<1b> and is a hydrogen atom or an aliphatic hydrocarbon group optionally having substituents, R<0> is a hydrogen atom or an aliphatic hydrocarbon group, or R and R<0> in combination represent a bond, Ar is an aromatic hydrocarbon group optionally having substituents <CHEM> or <CHEM> and the like, and n is an integer of 1 to 4, a salt thereof or a prodrug thereof, wherein the composition is adjusted to have a pH of not more than about 6, shows improved stability of the compound, a salt thereof or a prodrug thereof, and realizes expression of superior efficacy. |