Substance Search with Registry Number and Subject Terms

1 Substance Search with Registry Number and Subject Terms 

Registry Numbers may be taken over from the Registry File (Sect. 7.3.1) or searched directly. As Registry Numbers are documented in the Basic Index, field qualifiers are not demanded for them. 

S METHYL CELLULOSE S ME CELLULOSE S CELLULOSE METHYL ETHER S CELLULOSE ME ETHER S LI OR L2 OR L3 OR L4 OR L5 

When conducting a search for nitrogen oxide, NO, the word no, will also be retrieved and subsequently sentences like. ..with no poisonous residues. Only the Registry Number can help in this case to conduct a reasonable query. 

The example mistletoe extract shows that searching natural products using the common and Latin name is more successful than using Registry Numbers (Sect. 4.1). 

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