Remedies or preventives for pulmonary insufficiency containing diaminotrifluoromethylpyridine derivatives

A method for preventing or treating pulmonary insufficiency, comprising administering to a subject in need thereof an effective amount of a diaminotrifluoromethylpyridine compound or its salt, wherein said compound is represented by formula (I):

• wherein
• X is a —CW1R1 group, a —COCOR2 group, a —CW1NHCOR2 group, a —C(═W1)W2R3 group or a —CW1N(R4)R5 group;
• Y is an alkyl group, a —CW3R6 group, a —COCOR group, a —NHCOR7 group, a —C(═W3)W4R8 group, a —NH)mSO2R9 group, a —(NH)mSO2OR10 group or a —(NH)mSO2N(R11)R12 group;
• wherein each of R1, R6 and R9, which are independent of one another, is a chain hydrocarbon group which may be substituted, a monocyclic hydrocarbon group which may be substituted, a polycyclic hydrocarbon group which may be substituted, a monocyclic heterocycle group which may be substituted or a polycyclic heterocycle group which may be substituted;
• wherein each of R2 and R7, which are independent of each other, is an alkyl group which may be substituted, an alkoxy group which may be substituted, a phenyl group which may be substituted or a phenoxy group which may be substituted;
• wherein each of R3, R8 and R10, which are independent of one another, is an alkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, a cycloalkyl group which may be substituted, a phenyl group which may be substituted or a benzyl group which may be substituted;
• wherein each of R4, R5, R11 and R12, which are independent of one another, is an alkyl group which may be substituted;
• each of W1, W2, W3 and W4 which are independent of one another, is an oxygen atom or a sulfur atom;
• and
• wherein m is 0 or 1;
• wherein said compound of formula (I) is not a compound where one of X and Y is a —COCF2X1 group (wherein X1 is a hydrogen atom, a halogen atom, an alkyl group or a haloalkyl group), and the other is a —COCF2X2 group (wherein X2 is a hydrogen atom, a halogen atom, an alkyl group, a haloalkyl group or an alkylcarbonyl group), a —COOX3 group (wherein X3 is an alkyl group which may be substituted or a phenyl group which may be substituted) or a —COX4 group (wherein X4 is an alkyl group, a haloalkyl group, an alkenyl group, an alkynyl group, a phenyl group which may be substituted, a furanyl group or a naphthyl group).