I have already included the dmso.itp file.still I am getting the error atom type SD not found thanx in advance for helping me -- PRASUN (ASHOKA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://maillist.sys.kth.se/pipermail/gromacs.org_gmx-users/attachments/20080819/7bc485a6/attachment.html>