Absolute stereochemistry of dihydrofuroangelicins bearing C-8 substituted double bonds: a combined chemical/exciton chirality protocolElectronic supplementary information (ESI) available: Relative energies and relevant geometrical parameters of DFT-optimized structures of sty-2 and sty-5 (Table ESI1). Calculated and experimental 3JMe8,H9a and 3JMe8,H9b values (in Hz) for sty-2 and sty-5 (Table ESI2). UV absorption spectrum of 7-hydroxy-4-methylcoumarin in CH3CN (Fig. ESI1). Description of the procedure for estimating transition dipole moment positions from excited-states calculations. See http://www.rsc.org/suppdata/ob/b3/b312542d/