Provided by: chemtool_1.6.14-1_amd64 
NAME
cht - chemtool drawings analyzer
SYNOPSIS
cht [options] filename.cht
DESCRIPTION
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.
OPTIONS
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.
BUGS
cht can misinterpret molecules that contain the 'aromatic ring' symbol, as it uses a fixed search radius
to identify the aromatic system that it denotes. It also does not handle the 'partial double bond', so
you should avoid these two in drawings that you intend to use with cht.
A label that is offset from the corresponding bond end by more than five pixels is not recognized, so
that the default CH2 or CH3 group enters the calculation in its place.
In general, one should check the plausibility of the generated sum formula wherever possible.
SEE ALSO
chemtool(1)
AUTHOR
Radek Liboska