1 CTY Clarithromycin 1.000 2 ERY Erythromycin a 0.943 3 ERB Erythromycin B 0.925 4 ERN (3r,4s,5s,6r,7r,9r,10s,11s,12r,13s,14r)-10-amino-6-{[(2s,3r,4s,6r)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2h-py ran-2-yl]oxy}-14-ethyl-7,12,13-trihydroxy-4-{[(2r,4r,5s,6s)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2h-pyran-2-yl]oxy }-3,5,7,9,11,13-hexamethyloxacyclotetradecan-2-one 0.907 5 EY5 Erythromycin D 0.870 6 ZIT Azithromycin 0.857 7 ZIO (3s,5r,6s,7r,8r,11r,12s,13r,14s,15s)-6-hydroxy-5,7,8,11,13,15-hexamethyl-4,10-dioxo-14-{[3,4,6-trideoxy-3-(dimethylamino)-beta-D-xylo-hexopyranosyl]oxy}-1,9-dioxaspiro[2.13]hexadec-12-yl 2,6-dideoxy-3-O-methyl-alpha-L-arabino-hexopyranoside 0.818 8 ROX Roxithromycin 0.803