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| Type 1-Unlimited substitution |
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![]() Allophanyl ![]() |
![]() Carbazono ![]() |
![]() Guanidino ![]() |
![]() Hydantoyl ![]() |
![]() Hydrazino |
![]() Semicarbazido ![]() |
![]() Ureido ![]() |
![]() Ureylene ![]() |

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