Composition and method for stabilizing the same

A composition comprising a bi-cyclic compound represented by the formula (I):

• wherein,
• A is —CH2OH, —COCH2OH, —COOH or a functional derivative thereof,
• X1 and X2 are hydrogen atom, lower alkyl or halogen atom;
• V1 and V2 are carbon atoms;
• W1 and W2 are
• wherein R4 and R5 are hydrogen atom, hydroxy, halogen atom, lower alkyl, lower alkoxy or hydroxy (lower) alkyl with the proviso that R4 and R5 are not hydroxy or lower alkoxy at the same time;
• Z is an oxygen atom;
• R1 is a saturated or unsaturated bivalent lower-medium aliphatic hydrocarbon residue which is unsubstituted or substituted with halogen atom, an alkyl group, hydroxy, oxo, aryl or heterocyclic group;
• R2 is a saturated or unsaturated, lower or medium aliphatic hydrocarbon residue which is unsubstituted or substituted with halogen atom, oxo, hydroxy, lower alkyl, lower alkoxy, lower alkanoyloxy, lower cycloalkyl, lower cycloalkyloxy, aryl, aryloxy, heterocyclic group or heterocyclic-oxy group;
• lower cycloalkyl;
• lower cycloalkyloxy;
• aryl, aryloxy, heterocyclic group or heterocyclic-oxy group;
• R3 is a hydrogen atom, a lower alkyl, lower cycloalkyl, aryl or heterocyclic group, and a glyceride, in which the bi-cyclic compound is present in a ratio of at least 50:50 with respect to its tautomeric monocyclic compound.