3,6,9,12,15,18,21,24,27,30,33,36-dodecaoxanonatriacont-38-yn-1-ol

(2R,3R,4S,5S,6R)-2-((3,6,9,12,15,18,21,24-octaoxaheptacos-26-yn-1-yl)oxy)-6-(acetoxymethyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate