COC1=C(C)C2(C)CC(OC(C)=O)C3C(COC(C)=O)(C(OC(C)=O)C(C)C33C(C)=CC(OC(C)=O)C4(C)C(CC5(C)CC34OC5=O)OC(C)=O)C2CC1=O