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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 |