Patent ID: 7534897

Claim:
A compound of the formula (I): wherein a group represented by the formula: is a group represented by the formula: wherein Z 3 is ═C(—R 7 )—; R 4 , R 5 , R 6 and R 7 are each independently hydrogen, halogen, alkyl, or phenyl; R 1 is —COOH, or alkyloxycarbonyl; Z 4 is —C(—R 2 )═; R 2 is hydrogen or alkyl; R 15 is hydrogen; R 3 is a group represented by the formula: wherein r is an integer from 0 to 1; x is an integer from 0 to 1; m is an integer from 1 to 2, provided that x=m=2; a broken line represents the presence or absence of a bond; E is phenyl unsubstituted or substituted with halogen, alkyl, alkoxy, nitro, cyano, hydroxy, haloalkyl, or phenyl; naphthyl; thienyl unsubstituted or substituted with benzyl or halogen; benzothiophene; quinolinyl; pyridyl; alkyl; phenylalkyl; or phenylalkenyl; or a pharmaceutically acceptable salt thereof.