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This is the command cht that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



cht - chemtool drawings analyzer


cht [options] filename.cht


cht is a commandline tool to derive the sum formula and molecular mass of the molecule
depicted in a chemtool drawing file. It is also available from within chemtool to
calculate these data for the current structure or a marked fragment of it.

cht currently recognizes the element symbols C, H, O, N, P, S, Si, B, Br, Cl, F, I, Al,
As, Ba, Be, Bi, Ca, Cd, Co, Cr, Cs, Cu, Fe, Ga, Ge, In, K, Li, Mg, Mn, Na, Ni, Pb, Rb, Sb,
Sc, Se, Sn, Sr, Te, Ti, Tl, V, Zn (that is, all main group elements except the noble
gases, and the first row of transition metals) and the abbreviations Ac, Ade, Bn, Bu, iBu,
tBu, Bz, BOC, Cyt, CE, DBAM, DMAM, DMTr, Et, Gua, Me, Ms, MOC, MOM, MMTr, Ph, Pr, iPr, Tf,
Thy, Tol, Tr, Ts, TBDMS, TBDPS, TMS, TMTr, Ura, Z.

It can handle two levels of parentheses; e.g. P[OCH(CH_3)_2]_3.

When cht detects any duplicate (overlapping) bonds in the drawing file, it will prepend an
exclamation mark to the calculated (and likely wrong) sum formula.


cht understands the following options:

-h, --help
Displays brief help and list of options.

-e, --exact
Calculate exact mass for MS.

-v, --verbose
Be verbose.

-d, --debug
Be extremely verbose.

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