RES
1b:x-dxyl-PEN-x:x
2r:r1
3b:b-dxyl-PEN-1:5
4b:a-lara-PEN-1:4
LIN
1:1o(4+1)2n
2:2n(4+1)3d
3:3o(3+1)4d
REP
REP1:5o(4+1)5d=-1--1
RES
5b:b-dxyl-PEN-1:5