Extended Data Fig. 1: Chemical structures of the degradation products identified in the present study.

The figure was constructed using ChemDraw 18.2. E refers to ethylene glycol, T refers to terephthalic acid, TE refers to MHET, ETE refers to BHET, TETE refers to (MHET)2 as reported by Joo et al. (2018)34, and ETETE refers to 2-HE(MHET)2 as reported by Joo et al. (2018)34. Nomenclature as reported by Schubert et al.29.