EP1506779A1 - (3-(4-(Pyridin-2-ylamino)-butyryl)-2,3,4,4a,9,9a-hexahydro-1H-3-aza-fluoren-9-yl)-acetic acid derivatives and related tricyclic indanyls as alphaVbeta3 and alphaVbeta5 integrin inhibitors for the treatment of cancer and unstable angina