Hale-Bopp looks like a winner.
Weaver
H A
HA
D002248:Carbon Monoxide / Q000032:analysis; D005118:Extraterrestrial Environment; D005557:Formaldehyde / Q000032:analysis; D006856:Hydrogen Cyanide / Q000032:analysis; D019110:Meteoroids; D000432:Methanol / Q000032:analysis; D014867:Water / Q000737:chemistry
D014867:Water; D005557:Formaldehyde; D006856:Hydrogen Cyanide; D002248:Carbon Monoxide; D000432:Methanol