The first one is the imidazole ring that binds to amino acids in helix 7 (Asn295). The second group is the biphenyl-methyl group that binds to amino acids in both helices 6 and 7 (Phe301, Phe300, Trp253 and His256). The third one is the tetrazole group that interacts with amino acids in helices 4 and 5 (Arg167 and Lys199).
