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Table 1 Example of morphological (spelling) variations for a chemical, 8-SPT, as observed within MEDLINE abstracts. 8-SPT is also found abbreviated as 8SPT, 8SPTH, and 8-PSPT.

From: A scalable machine-learning approach to recognize chemical names within large text databases

# Chemical Name # timesobserved % of total
1 8-(p-sulfophenyl)theophylline 13 19.1%
2 8-sulfophenyltheophylline 10 14.7%
3 8-sulphophenyltheophylline 8 11.8%
4 8-(p-sulphophenyl)theophylline 5 7.4%
5 8-(p-sulfophenyl)-theophylline 4 5.9%
6 8-(p-sulphophenyl)-theophylline 4 5.9%
7 8-(p-sulphophenyl) theophylline 3 4.4%
8 8-(p-sulfophenyl) theophylline 3 4.4%
9 8-p-sulpho-phenyltheophylline 2 2.9%
10 8(p-sulfophenyl)theophylline 2 2.9%
11 8-(sulfophenyl)theophylline 1 1.5%
12 8-p-sulfophenyl theophylline 1 1.5%
13 8-(4-sulfophenyl)theophyline 1 1.5%
14 8 (p-sulphophenyl) theophylline 1 1.5%
15 8-(sulfophenyl) theophylline 1 1.5%
16 8-p-sulfophenyltheophylline 1 1.5%
17 8-p-sulphophenyltheophylline 1 1.5%
18 8(p-sulfophenyl)-theophylline 1 1.5%
19 8-rho-(sulfophenyl)theophylline 1 1.5%
20 8-sulphophenyl-theophylline 1 1.5%
21 8-(p-sulfophenyl)-theophyllin 1 1.5%
22 8-(para-sulfophenyl)theophylline 1 1.5%
23 8-p-sulfophenyl-theophylline 1 1.5%
24 8-(p-sulfophenyl)-theophylline) 1 1.5%