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Table 1 Description and examples of the expressing methods of chemical structural information ([5, 8] andhttp://en.wikipedia.org)

From: Chemical named entities recognition: a review on approaches and applications

Expressing method Description Example
1. Systematic names reflect the information of the chemical structure. International Union of Pure and Applied Chemistry (IUPACh) ‘3-(3,4-dihydroxyphenyl)prop-2-enoic acid’
2. Trivial names they do not reflect the structure of the chemical substance. ‘caffeic acid’ utilized for ‘3-(3,4-dihydroxyphenyl)prop-2-enoic acid’.
3. Semi systematic names at least one part is used in the systematic sense, IUPAC-like, non-IUPAC names. in‘N-benzoylglycine’ the part ‘benzoyl’ is systematic, whereas ‘glycine’ is the trivialname for ‘_-aminoacetic acid’
4. Common or generic names names applied to a class of compounds camphor, water and alcohol
5. Registered trademark/brand names they identify the brand owner as the commercial source of products. ‘aspirin’
6. Company codes a company code is to identify the compound within the company. ZD5077 = ICI204636 = ZM204636
7. Acronyms and abbreviations they are used to get short names. DMS for dimethyl sulfate
8. Index and reference numbers from Chemical Abstracts Service (CAS) registry numbers, Beilstein registry numbers, etc CAS number of water is 7732-18-5
9. Anaphors Compounds are named earlier in the text but co-referenced to a shorter name, called the anaphor, later in the text. A compound number is anaphor where … bioactivity is found in compounds [17, 911] listed in Additional file 1…’
10. Sum formula Consists of the elements contributing to a compound and the number of their occurrences C9H8O4’
11. Chemical structures explicit and implicit structures Markush structures, where R1 = CH3, COOH, etc…