RES
1b:b-drib-PEN-1:5
2b:b-dxyl-PEN-1:5
3b:b-dxyl-PEN-1:5
4s:anhydro
LIN
1:1o(4+1)2d
2:2o(4+1)3d
3:1d(2+1)4n
4:1o(3+1)4n