When I use doGlycans and I specify the OPLS-AA forcefield, the sugar residues in the topology (.itp) file have custom atom types ending in "_S". I followed the tutorial for adding glycans to glycoproteins exactly. How do I fix this problem, short of doing it manually for every sugar atom? (And, if this is the solution, is there a database of OPLS atom types for sugar residues?)

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