3-(6-(2-(Benzyloxy)ethyl)-8-oxa-1-azabicyclo[3.2.1]oct-7-yl)propyl phenyl sulfone 6-(2-(Benzyloxy)ethyl)-7-(3-(phenylsulfonyl)propyl)-8-oxa-1-azabicyclo[3.2.1]octane AIDS-142777 AIDS142777 NSC660832