Synthesis and molecular modelling studies of resorcin[4]arene-capped porphyrinsElectronic supplementary information (ESI) available: Benzene-d6 shifts of compound 7 compared with those of component units, details on the new parameters added to heme29 and cartesian coordinate files of lowest-energy conformations of 3, 5 and 7 (benzene inside) on the molecular modelling studies (pdb and arc files). See http://www.rsc.org/suppdata/ob/b3/b303741j/See Ref. 1.