Functional groups
4. Isobutyl
5. Tertiary Butyl
6. Methyl
7. Vinyl
8. Allyl
9. Carboxyl
10. Methyl Ketone
11. Acetate
12. Carbomethoxy
13. Carboxylate
14. Amine
15. Carbonyl
16. Methyl Ether
17. Ethyl Ether
21. Isocynate
22. Imine
23.Isoimine
24. AZO
25. Hydrazo
26. Nitoso
27. Nitro
28. Sulfone
29. Oxime
30. Pyruvate