% acetyl


               c(1,12,(0,nonchiral))-[o(1,nil)~~,c(2,right)~],
               c(2,12,(0,nonchiral))-[c(1,left)~,h(1,right)~,h(3,up)~,h(2,down)~],
               h(1,1,(0,nonchiral))-[c(2,left)~],
               h(2,1,(0,nonchiral))-[c(2,up)~],
               h(3,1,(0,nonchiral))-[c(2,down)~],
               o(1,16,(0,nonchiral))-[c(1,nil)~~]