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| Type 1-Unlimited substitution |
![]() |
![]() Aniline |
![]() Rhodanine |
![]() Hydantoin |
![]() Barbituric acid |
![]() Benzidine (4, 4"-isomer only) |
![]() |
| Type 3-No substitution |
![]() |
![]() Toluidine (p-isomer shown) |
![]() Alloxane |

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