Bryant Henry Uhlmann

The present invention provides a compound of formula I wherein R is -H, -OH, -O(C -C alkyl), -OCOC H , -OCO(C -C alkyl), or -OSO (C -C alkyl); R² is -H, -OH, -O(C -C alkyl), -OCOC H , -OCO(C -C alkyl) or -OSO (C -C alkyl); n is 2 or 3; and…