https://cactus.nci.nih.gov/chemical/structure/histaminium/file?format=sdf&get...
__Jmol-14_08052212403D 1   1.00000     0.00000     0
Jmol version 14.32.63  2022-07-11 16:39 EXTRACT: ({0:17})
 18 18  0  0  0  0            999 V2000
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   -1.0881    0.5097    0.5155 C   0  0  1  0  0  0
    0.3605    0.2082    0.2297 C   0  0  0  0  0  0
    1.3068    1.1089   -0.0968 C   0  0  0  0  0  0
    2.4732    0.4134   -0.2684 N   0  0  0  0  0  0
    2.1988   -0.8891   -0.0407 C   0  0  0  0  0  0
    0.9345   -1.0036    0.2616 N   0  0  0  0  0  0
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    1.1715    2.1751   -0.2032 H   0  0  0  0  0  0
    3.3358    0.7864   -0.5087 H   0  0  0  0  0  0
    2.9090   -1.7009   -0.0955 H   0  0  0  0  0  0
  1  2  1  0  0  0
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 10 18  1  0  0  0
M  END