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Special Features on Different Hosts

Apart from ESA-IRS, all hosts are providing nomenclature files, generated from the Registry database. Some hosts have divided the files up into several smaller files, DIALOG e.g. provides one file for those substance names that have been mentioned only once in the literature, while another file contains substance names already mentioned at least twice. [Pg.272]

There are only two hosts which provide the possibility of searching the nomenclature file with the structure formula of a compound QUESTEL and STN International. Here, the chemist can quickly display structure formulae of compound names however complicated. But the most important advantage of structure files - unequaled by any printed service - is the possibility of searching for substructures (Sect. 7.2). [Pg.272]

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