Hydroporphyrins of the chlorin, bacteriochlorin, and corrin families are ubiquitous chromophores in nature, and they play important roles in many biological processes. 1 Also, chlorins and bacteriochlorins are promising substrates for use in tumor photodynamic therapy (PDT). 2 The most complex members of this group are the corrins, which incorporate up to 10 stereogenic centers within the macrocycle. A noteworthy accomplishment in this ...