Octatetraynyl radical

Octatetraynyl radical (C₈H) is an organic free radical with eight carbon atoms linked in a linear chain with alternating single bonds and triple bonds (H−C≡C−C≡C−C≡C−C≡C•).

Octatetraynyl radical

Skeletal formula of the octatetraynyl radical with the explicit hydrogen added
Names
Preferred IUPAC name Octa-1,3,5,7-tetrayn-1-yl
Identifiers
3D model (JSmol)	Interactive image anion: Interactive image
ChemSpider	10809239 Y
PubChem CID	57417316 anion: 100986430
InChI InChI=1S/C8H/c1-3-5-7-8-6-4-2/h1H Y Key: GTEOCQSGHJLKQX-UHFFFAOYSA-N Y anion: InChI=1S/C8H/c1-3-5-7-8-6-4-2/h1H/q-1 Key: JPYHXIJMECKQLV-UHFFFAOYSA-N
SMILES [C]#CC#CC#CC#C anion: [C-]#CC#CC#CC#C
Properties
Chemical formula	C8H
Molar mass	97.096 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

In 2007 negatively charged octatetraynyl was detected in Galactic molecular source TMC-1, making it the second type of anion to be found in the interstellar medium (after hexatriynyl radical) and the largest such molecule detected to date.^[1][2]