edge count of heavy molecules

heavy molecules | edge count

1 | deuterium hydride | 1 2 | water-18 O | 2 3 | heavy water | 2 4 | ammonia-15 N | 3 5 | formic acid-13 C | 4 6 | deuterated silane | 4 7 | chloromethane-13 C | 4 8 | methanol-d | 5 9 | methanol-13 C | 5 10 | formamide-13 C | 5 11 | acetonitrile-1-13 C | 5 12 | acetaldehyde-2, 2, 2-d 3 | 6 13 | methyl (-{2}-h)formate | 7 14 | ethylene oxide-13 C2 | 7 15 | acetic acid-13 C2 | 7 16 | ethanol-1-13 C | 8 17 | propionitrile-d 5 | 8 18 | allyl-d 5alcohol | 9 19 | acetone-2-13 C | 9 20 | trimethylamine-15 N | 12