Infrared Space Observatory's Discovery of C4H2, C6H2, and Benzene in CRL 618

By J. Cernicharo, A. Heras, A. Tielens, J. Pardo, F. Herpin, M. Guélin, L. Waters. 2001

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2018 Census of Interstellar, Circumstellar, Extragalactic, Protoplanetary Disk, and Exoplanetary Molecules (2018, background): “HC6H (triacetylene) Cernicharo et al. (2001) reported the detection of HC6H in ISO observations of CRL 618.”
Discovery of the Pure Polycyclic Aromatic Hydrocarbon Indene (c-C9H8) with GOTHAM Observations of TMC-1 (2021, background): “A single infrared vibrational transition of the simplest aromatic molecule, benzene (c-C6H6), has been detected toward a handful of evolved sources (Cernicharo et al. 2001; Cami et al. 2010; Berné et al. 2013), but has limited utility as atmospheric absorption prevents its ground-based…”
ISO Spectroscopy of Gas and Dust: From Molecular Clouds to Protoplanetary Disks (2004, background): “Although not formally part of this review, the exciting SWS discoveries of C6H6 (benzene), C6H2 and C4H2 (Cernicharo et al. 2001a) and C2H4 (Cernicharo et al. 2001b) toward CRL 618 should be mentioned.”