u2014 oh 3 67 1h m ch u2014 oh 2 75 2h m 2 41 2h t 2 48 1 20 16h m the compound is synthesized using the procedure described in example 4 starting from latanoprost acid and 3 bromopropanol the compound is synthesized using the procedure described in example 4 starting from latanoprost acid and 2 bromoethanol the compound is synthesized using the procedure described in example 4 starting from latanoprost acid and 6 bromohexanol the compound is synthesized using the procedure described in example 4 starting from latanoprost acid and 1 bromo 2 propanol the compound is synthesized using the procedure described in ample 4 starting from latanoprost acid and 2 chloro 1 propanol the compound is synthesized using the procedure described in example 4 starting from latanoprost acid and 1 3 dibromo 2 propanol the compound is synthesized using the procedure described in example 2 starting from latanoprost acid and ferulic acid 2 nitrooxy ethyl ester the compound is synthesized using the procedure described in example 2 starting from latanoprost acid and ferulic acid 3 nitrooxymethyl phenyl ester the compound is synthesized using the procedure described in example 2 starting from latanoprost acid and ferulic acid 4 nitrooxymethyl benzyl ester the compound is synthesized using the procedure described in ample 4 starting from latanoprost acid 4 chloromethyl phenyl ester the compound is synthesized using the procedure described in example 4 starting from latanoprost acid 4 bromomethyl benzyl ester preparation of an ophthalmic composition.