Left: Assignments for 1H-signals from 500 MHz 1H-NMR spectra of Cj-YCC (2) in CD3OD and correlations from H,H-COSY- and ROESY-spectra16 (solid lines and arrows). Centre: Assignment of 13C-signals from 1H,13C-heteronuclear correlations in HSQC-and HMBC-spectra.16 Right: Atom-numbering for 1 and 2, based on that proposed by IUPAC for the chlorophylls; however, simple 2- and 3-digit numbers are used here (e.g. 172) (in the text, an upper case number indicates the position on the side chain, e.g. 172, as suggested by IUPAC, see e.g. ref. 19).