The most efficient and complete way to search for chemical substances in the Chemical Abstracts Online database is to use the CAS registry number(s). There is no structural significance to the registry number - it is simply an identifier. Even if other names are created for this compound, the registry number will remain unchanged. There is just one CAS registry number which is 103-90-2. Another systematic name for this same compound is 4'-Hydroxyacetanilide. The systematic name for this analgesic compound is Acetamide, N-(4-hydroxyphenyl). For example, Tylenol is a brand name for acetaminophen which is itself a trivial name. trade or brand name(s) generic or common name(s) trivial or semisystematic name(s) and systematic or IUPAC name(s). The rules of chemical nomenclature frequently change and each chemical substance is liable to have several names: i.e. There are over 144 million chemical substances & sequences currently registered and 12,000 new substances are added every day!! Each individual chemical substance is assigned a CAS Registry Number which may be thought of as that substance's "Social Security number." (For more information, see What does a CAS Registry Number look like?) Chemical Abstracts Service (CAS) has a registry system for all completely identified chemical compounds or substances.
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