![1: Protonation at secondary amino nitrogen atoms: change of C-N bond... | Download Scientific Diagram 1: Protonation at secondary amino nitrogen atoms: change of C-N bond... | Download Scientific Diagram](https://www.researchgate.net/publication/281629934/figure/fig16/AS:614136165707813@1523432880795/Protonation-at-secondary-amino-nitrogen-atoms-change-of-C-N-bond-lengths-in-A-unit-is.png)
1: Protonation at secondary amino nitrogen atoms: change of C-N bond... | Download Scientific Diagram
![Proline amino acid molecule. Oxygen, Carbon and Nitrogen atoms shown as circles in vector illustration. 25360987 Vector Art at Vecteezy Proline amino acid molecule. Oxygen, Carbon and Nitrogen atoms shown as circles in vector illustration. 25360987 Vector Art at Vecteezy](https://static.vecteezy.com/system/resources/previews/025/360/987/original/proline-amino-acid-molecule-oxygen-carbon-and-nitrogen-atoms-shown-as-circles-in-illustration-vector.jpg)
Proline amino acid molecule. Oxygen, Carbon and Nitrogen atoms shown as circles in vector illustration. 25360987 Vector Art at Vecteezy
![Amino group, (primary, -NH2). It is functional group comprised of a nitrogen atom linked to hydrogen atoms. Amino group attached to an organic Stock Vector Image & Art - Alamy Amino group, (primary, -NH2). It is functional group comprised of a nitrogen atom linked to hydrogen atoms. Amino group attached to an organic Stock Vector Image & Art - Alamy](https://c8.alamy.com/comp/2H1J90A/amino-group-primary-nh2-it-is-functional-group-comprised-of-a-nitrogen-atom-linked-to-hydrogen-atoms-amino-group-attached-to-an-organic-2H1J90A.jpg)
Amino group, (primary, -NH2). It is functional group comprised of a nitrogen atom linked to hydrogen atoms. Amino group attached to an organic Stock Vector Image & Art - Alamy
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