Hydrogen Compounds
| H2 | HD | H3+ | H2D+ |
Hydrogen and Carbon Compounds
| CH | CH+ | C2 | CH2 | C2H | *C3 |
| CH3 | C2H2 | C3H+ | C3H(lin) | c-C3H | *CH4 |
| C4 | c-C3H2 | l-C3H2 | H2CCC(lin) | C4H | *C5 |
| *C2H4 | C5H | H2C4(lin) | *HC4H | CH3C2H | C6H |
| *HC6H | H2C6 | *C7H | CH3C4H | CH3C6H | C8H |
| C8H- | C3H6 | *C6H6 | C60 | C70 |
Hydrogen, Carbon (possibly) and Oxygen Compounds
| OH | OH+ | O2 | CO | CO+ | H2O |
| H2O+ | HO2 | HCO | HCO+ | HOC+ | C2O |
| CO2 | H3O+ | H2O2 | HOCO+ | H2CO | C3O |
| CH3O | CH2CO | HCOOH | H2COH+ | CH3OH | CH2CHO |
| CH2CHOH | CH2CHCHO | HC2CHO | C5O | CH3CHO | c-C2H4O |
| c-C3H2O | CH3OCHO | CH2OHCHO | CH3COOH | CH3OCH3 | CH3CH2OH |
| CH3CH2CHO | (CH3)2CO | HOCH2CH2OH | CH3OCOCH3 | C2H5OCHO | C2H5OCH3 |
| (CH2OH)2CO? |
Hydrogen, Carbon (possibly) and Nitrogen Compounds
| NH | NH+ | CN | CN- | C2N | N2 |
| NH2 | HCN | HNC | N2H+ | NH3 | HCNH+ |
| H2CN | HCCN | C3N | HC3N | CH2CN | CH2NH |
| HC2CN | HC2NC | NH2CN | C3NH | HNCNH | CH3CN |
| CH3NC | HC3NH+ | *HC4N | C5N | C5N- | CH2CNH |
| HNCHCN | CH3NH2 | CH2CHCN | CH3CONH2 | HC5N | H2NCH2NC |
| CH3CHNH | CH3C3N | CH2CCHCN | CH3CH2CN | HC7N | CH3C5N? |
| HC9N | n-C3H7CN | i-C3H7CN | HC11N |
Hydrogen, Carbon (possibly), Nitrogen and Oxygen
Compounds
| NO | NO+ | HNO | N2O | HNCO | HOCN |
| HCOCN | H2NCO+ | NH2CHO |
Other Species
| SH | SH+ | CS | SO | SO+ | NS |
| SiH | *SiC | SiN | SiO | SiS | HCl |
| HCl+ | H2Cl+ | *NaCl | *AlCl | *KCl | *KCN |
| HF | CF+ | *AlO | *AlF | *CP | HCP |
| CCP | PN | PO | PH3 | H2S | C2S |
| SO2 | OCS | HCS+ | HSCN | c-SiC2 | *SiCN |
| *SiNC | *NaCN | *MgCN | *MgNC | HMgNC | *AlNC |
| *AlOH | H2CS | HNCS | C3S | c-SiC3 | *SiH4 |
| *SiC4 | CH3SH | CH3CH2SH | C5S | FeO | FeCN |
| TiO | TiO2 | ArH+ |
- Species in Italic have been detected by electronic absorption (visible or UV). When they have also been detected in radio, they are underligned.
- Molecular ions are in bold face.
- * circumstellar species
- (c) means cycles, (lin) or (l) linear molecules