Known Interstellar Molecules (Total: 136 as of May 2002)
Number
of Atoms
|
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
|
|
H2
|
H2O
|
NH3
|
SiH4
|
CH3OH
|
CH3COH
|
CH3CO2H
|
CH3CH2OH
|
|
OH
|
H2S
|
H3O+
|
CH4
|
NH2CHO
|
CH3NH2
|
HCO2CH3
|
(CH3)2O
|
|
SO
|
SO2
|
H2CO
|
CHOOH
|
CH3CN
|
CH3CCH
|
CH3C2CN
|
CH3CH2CN
|
|
SO+
|
HN2+
|
H2CS
|
HCCCN
|
CH3NC
|
CH2CHCN
|
C7H
|
H(CC)3CN
|
|
SiO
|
HNO
|
HNCO
|
CH2NH
|
CH3SH
|
HC4CN
|
H2C6
|
H(CC)2CH3
|
|
SiS
|
SiH2?
|
HNCS
|
NH2CN
|
C5H
|
C6H
|
C8-?
|
C8H
|
|
FeO?
|
H2D+
|
CH2D+?
|
CH2CN
|
C
5S?
|
l-H2C2HOH
|
CH2OHCHO
|
C
9-?
|
NO
|
NH2
|
CCCN
|
H2CCO
|
HC2CHO
|
c-CH2OCH2
|
l-HC6H
|
|
NS
|
H3+
|
HCO2+
|
C4H
|
CH2=CH2
|
C7-
|
|
|
|
HCl
|
NNO
|
l-CCCH
|
c-C3H2
|
H2CCCC
|
|
|
10
|
|
NaCl
|
HCO
|
c-CCCH
|
l-H2CCC
|
HC3NH+
|
|
KCl
|
HCO+
|
CCCO
|
C5
|
C5N
|
|
|
CH3COCH3
|
|
AlCl
|
OCS
|
CCCS
|
SiC4
|
C6-?
|
|
|
CH3(CC)2CN?
|
|
AlF
|
CCH
|
HCCH
|
H
3CO+
|
|
|
|
(CH2OH)2?
|
|
PN
|
HCS+
|
HCNH+
|
HCCNC
|
|
|
|
|
SiN
|
c-SiCC
|
HCCN
|
HNCCC
|
|
|
|
11
|
|
NH
|
CCO
|
H2CN
|
|
|
|
|
H(CC)4CN
|
|
SH
|
CO2
|
c-SiC3
|
|
Organic molecules in green
|
|
12
|
HD
|
AlNC
|
|
|
Inorganic molecules in pink
|
|
HF
|
SiCN
|
|
|
|
|
|
C6H6
|
CH
|
CCS
|
|
|
|
|
|
|
CH+
|
C3
|
|
|
|
|
|
13
|
|
CN
|
MgNC
|
|
|
|
|
|
|
|
CO
|
NaCN
|
|
|
|
|
|
H(CC)5CN
|
|
CS
|
CH2
|
|
|
|
|
|
|
|
C2
|
MgCN
|
|
|
|
|
|
Total:
136
|
|
SiC
|
HOC+
|
|
|
|
|
|
|
|
CP
|
HCN
|
|
|
|
|
|
|
|
CO+
|
HNC
|
|
|
|
|
|
|
|
KCN?
|
|
|
|
|
|
|