CHT(1)								   User commands							    CHT(1)

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

1.6.13								   June 17, 2001							    CHT(1)