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. 2021 Nov 6;26(21):6715. doi: 10.3390/molecules26216715
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(11) pyrrole, C4H5N (12) 1-pyrroline, C4H7N (13) pyrrolidine, C4H9N (14) pyridine, C5H5N
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(15) 1-piperideine, C5H9N (16) piperidine, C5H11N (17) pyrimidine, C4H4N2 (18) 1,3,5-triazine, C3H3N3
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(19) quinoline, C9H7N (20) isoquinoline, C9H7N