1 EFZ (-)-6-chloro-4-cyclopropylethynyl-4-trifluoromethyl-1,4-dihydro-2h-3,1-benzoxazin-2-one 1.000 2 9ZJ (2r,4s)-6-chloro-4-(cyclopropylethynyl)-2-methyl-4-(trifluoromethyl)-1,4-dihydro-2h-3,1-benzoxazine 0.909