Nystatin Impurity 7

(1S,3R,4R,7R,9R,11R,15S,16S,17R,18S,19E,21E,25E,27E,29E,31E,33R,35S,36R,37S) -33- (((2R,3S,4S,5S,6R) -4-amino-3,5-dihydroxy-6-methyltetrahydro-2H-pyran-2-yl) oxy) -17- (((3S,4R,5R,6S) -4,5-dihydroxy-3,6-dimethyltetrahydro-2H-pyran-2-yl) oxy) -1,3,4,7,9,11,37-heptahydroxy-15,16,18-trimethyl-13-oxo-14,39-dioxabicyclo[33.3.1]nonatriaconta-19,21,25,27,29,31-hexaene-36-carboxylic acid