Patent ID: 8859784

Claim:
A substantially stereomerically pure compound according to structural Formulas II(a), III(a), III(b), IV(a) or IV(b): or salts and hydrate thereof, wherein: A is CR 1 R 2 , wherein R 1 and R 2 are each independently selected from -H, and -CH 2 CH 3 ; M and M′ are CR 3 R 4 wherein R 3 and R 4 are H; with the provisos that (a) A can be —CH═CH— when M and M′ are CR 3 R 4 ; and (c) when M and M′ are CR 3 R 4 and have one or more stereocenters, the stereocenters of M and M′ are of opposite stereochemistry.