1-((eicosanoyloxy)methyl)-1-methyl-4-(2-methyl-10H-benzo[b]thieno[2,3-e][1,4]diazepin-4-yl)piperazin-1-ium iodide 、
2,2-二甲基十四烷酸 在
final product 作用下,
以to give Compound 18 (1.84 g)的产率得到1-(((2,2-dimethyltetradecanoyl)oxy)methyl)-1-methyl-4-(2-methyl-10H-benzo[b]thieno[2,3-e][1,4]diazepin-4-yl)piperazin-1-ium iodide