1. There are several free online services that allow for multiple searching of companies when looking for peptides or peptide related reagents. These websites may cover less companies than the services listed below in section two, but they are more accessible.

• Biocompare

• BioSupplyNet - an online guide for researchers to find peptide-related supplies. Search by keyword entry or by searchable categories such as peptide synthesis reagents, peptide substrates, peptide analysis reagents, etc...  One can also obtain a list of pertinant companies and contact information.

• emolecules - a free, online, and searchable way to find a variety of commercially available chemicals, including amino acid derivatives, peptides, coupling reagents, etc... One can search the catalogs of 150+ suppliers by trivial name, trade name, CAS number, SMILES format, or structure. The result is a sortable list of structures, suppliers, product number, and various chemical properties. This website is recommended for its broad coverage and ease of use.

• Linscott's Directory of Immunological & Biological Reagents - contains more than 100,000 commercial and governmental supplier listings including suppliers of peptides and custom services.

2. Many searchable chemical databases exist which will allow you to find a wide variety of chemicals, including amino acids, peptides, and peptide synthesis reagents. Typically, one can search based on structure, name, formula, supplier, etc... Unless indicated otherwise, these resources require the installation of proprietary (and sometimes costly) interface software dependent on an Oracle® or Windows® server database:

• Available Chemicals Database (ACD) - offered by Symyx - a large structure-searchable collection of commercially available chemicals which shows pricing and supplier information for over 1,160,000 unique chemicals from 840+ suppliers worldwide

• Available Chemicals Exchange (ChemACX) - offered by CambridgeSoft - a structure/name searchable database of over 550 vendors, available by subscription.

• DiscoveryGate (ACD) - a second way to access ACD offered by Symyx. Same as above but allows researchers to use ACD in a web-based environment using a browser interface.

• Chemicals Available for Purchase (CAP) - offered by Accelrys