Fig. 1 in Intramolecular transesterification of depsides yields fluorescent 1H-isochromen-1-ones: Application as a chemical probe for lichen determination

Fig. 1. Molecular structures of glomelliferic acid 1 and glomellic acid 2 and their fluorescent behaviour upon addition of K. Key 2-oxoalkyl motif highlighted in blue. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)