preparation. Mathematica combines interactive calculation (both numeric and
symbolic), visualization tools, and a complete programming environment.
Mathematica runs on Windows - based PC ’ s, Macintosh with OS X 10.2 and
higher, and workstations. A Web - based version is available.
4.6 World Wide Web Online Resources,
Any listing of World Wide Web online resources becomes obsolete and incom-
plete as soon as it is written down. Sites come and go daily, probably hourly
or by the millisecond. Two web - based lists of lists that might be helpful are
found at http://www.chem.ucla.edu/VL/InfoRes.html (a list of information
resources for biologists and chemists) and http://www.chem.ucla.edu/
VL/Commercial.html (a list of WWW Chemistry Sites at Commercial
Organizations).
4.6.1 Nomenclature and Visualization Resources,
Nomenclature resources help the user give correct names to chemical struc-
tures. Visualization resources allow the user to build molecules from scratch
or display molecular structures imported from databases or other software
programs (like the Protein Data Bank, PDB, for example).
MDL Information Services, Inc. offers free software downloads for chemists
at http://www.mdl.com/downloads/search_by_si/si_chemistry.jsp. The AutoNom
2000 Add - in is a no - fee download for licensed users of the MDL TM products.
AutoNom 200 requires MDL ISIS or Isentris products running on Windows
XP. AutoNom generates IUPAC chemical names directly from graphical chemi-
cal structures. It provides names for stereoisomers, designating R,S confi gura-
tions for chiral compounds, and E,Z descriptors for geometrical isomers.
AutoNom is offered under license from MDL Information Systems GmbH.
MDL TM ISIS/Draw 2.5 is available as a no - fee download for academic and
personal home use only. ISIS/Draw enables you to electronically draw and
insert your sketches into documents, Web pages, spreadsheets, and presenta-
tions. You can also use ISIS/Draw to create structures to register into 2D and
3D molecule, polymer, and reaction databases, as well as to create queries for
searching these databases. This version of MDL ISIS/Draw does not include
enhanced stereochemistry features. Enhanced stereochemistry requires the
commercial version of ISIS/Draw 2.5 and MDL ISIS/Host 5.0. It operates with
the Windows operating system. A Macintosh version is available but not sup-
ported by MDL. MDL TM Chime, version 2.6 SP3 is a plug - in that interactively
displays 2D and 3D molecules directly in Web pages. You can rotate, reformat,
and save the molecules for use in other programs. You will be required to accept
a license agreement when you install the program. MDL makes selective grants
of licenses to MDL Chime users operating over a network, or for redistribution
to other users. Macintosh or Windows operating systems are supported.
WORLD WIDE WEB ONLINE RESOURCES 181