K93 k93 12-oxidanyl-9,11$l^{3}-dioxa-1$l^{4},19$l^{4},22,27$l^{4},28$l^{4}-pentaza-10$l^{6}-lutetaoctacyclo[17.5.2.1^{3,7}.1^{10,13}.0^{1,10}.0^{10,19}.0^{10,28}.0^{17,27}]octacosa-3,5,7(28),11,13,15,17(27)-heptaen-8-one K93