Patent ID: 7795299

Claim:
A compound of Formula I: wherein: R 3 , R 4 , R 5 , R 6 , R 8 , and R 9 are each independently selected from the group consisting of H, lower alkyl, hydroxy, lower alkoxy, halo, amino, aminoalkyl, and nitro; R 7 is selected from the group consisting of H, lower alkyl, hydroxy, halo, amino, aminoalkyl, and nitro; R 1 and R 2 together form a covalent bond; X 1 is selected from the group consisting of O, S, NH, SO, and SO 2 ; X 2 is selected from the group consisting of C═O, C═S, and C═NH; X 3 is selected from the group consisting of O, S, and NH; or a pharmaceutically acceptable salt thereof; subject to the proviso that neo-tanshinlactone is excluded therefrom.