(4S)-6-Chloro-4-cyclopropylethynyl-4-trifluoromethyl-1,4-dihydro-benzo[d][1,3]oxazin-2-one & 3'-Azido-3'-deoxy-5'-tetrahydrogen triphosphate thymidine AIDS-121641 AIDS121641 AZTTP+efavirenz EFV-AZTTP Efavirenz & AZTTP