O H 3 C O CH 3 HO H 3 C O CH 3 O H 3 C O H 3 C O CH 3 CH 3 OH O CH 3 Cl (R) (S) O (S) (R) (R) (S) N (S) (R) O (S) (R) (S) (R) (R) (S) H H (E) (E)