The minimal example shows diagonal lines. Since the line output of pictex is limited, I would choose PSTricks as output driver for better quality. When I enable the pstricks option, these diagonal lines collide with the radical atoms. You can easily reproduce this by removing the % comment symbol. How can we improve the postscript output. Any hints are appreciated. Best regards, Helge Kruse \documentclass{minimal} \usepackage%[pstricks] {m-ch-en} \begin{document} \setupchemical[scale=small,width=fit,frame=off] \setupchemical[top=1200,bottom=1200] \[ \startchemical[right=2500] \chemical[ONE,SB258,Z05][CH,CH_3] \chemical[PB:Z2,Z0,SB1,Z1,PE][ O,C_2H_5] \chemical[PB:Z8,Z0,SB1,Z1,PE][ O,C_2H_5] \stopchemical \] \end{document} PS: I wrote this to ntg-ppchtes@ntg.nl as sussgested at http://www.pragma-ade.com/link-1.htm, but that list appears as dead.