1 M6B (1r,2r,3r,6r,7s,8s,9r,10r,12r,13s,17s)-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15,15,17-octamethyl-5-oxo-9-(prop-2-yn-1-yloxy)-4,14,16-trioxabicyclo[11.3.1]heptadec-7-yl {3-[N'-(methylcarbamoyl)carbamimidamido]propyl}carbamate 1.000 2 M6F (3r,4s,5s,6r,7r,9r,10s,11s,12r,13s,14r)-14-ethyl-7,10,12,13-tetrahydroxy-3,5,7,9,11,13-hexamethyl-2-oxo-6-(prop-2-yn-1-yloxy)oxacyclotetradecan-4-yl {3-[N'-(methylcarbamoyl)carbamimidamido]propyl}carbamate 0.727 3 M6V (1r,2r,3r,6r,7s,8s,9r,10r,12r,13s,17s)-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15,15,17-octamethyl-5-oxo-9-(prop-2-yn-1-yloxy)-4,14,16-trioxabicyclo[11.3.1]heptadec-7-yl {4-[N'-(methylcarbamoyl)carbamimidamido]butyl}carbamate 0.707 4 M6A (1r,2r,3r,6r,7s,8s,9r,10r,12r,13s,17s)-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15,15,17-octamethyl-5-oxo-9-(prop-2-yn-1-yloxy)-4,14,16-trioxabicyclo[11.3.1]heptadec-7-yl {2-[N'-(methylcarbamoyl)carbamimidamido]ethyl}carbamate 0.702