The interactive program convsyb converts SYBYL MOL2 format files into a number of other formats useful for dock and some of the accessory programs. Output options include "extended pdb format," dock 3.0 database format, and standard pdb format. convsyb assumes that each @<tripos>molecule record type indicator corresponds to a single covalently bonded structure, and uses the first 9 characters of the line following this record as the refcode for the structure. Multi-mol2 files are handled correctly.