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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%