N-(4-pentynoyl)-mannosamine-tetraacylated(Ac4ManNAl)providesthefirstpartofasimpleandrobusttwo-steptechniquethathelpsidentifyandcharacterizecellsurfacesialicacid-containingglycoproteins.Thealkyne-modifiedproteinisdetectedwitheitherfluorescentazidesorbiotinazide.Theacetylgroupsincreasecellpermeabilityandallowtheunnaturalsugarstoeasilypassthroughthecellmembrane.Carboxyesterasesremovetheacetylgroupsoncethemonosaccharideisinthecell.

| Molecularweight | 427.40 |
| Chemicalcomposition | C19H25NO10 |
| CAS | 935658-93-8 |
| Solubility | DMSO,DMF,DCM,THF,Chloroform |
| Purity | >90% |
| Appearance | Whitetogreyamorphoussolid |
| Storageconditions | -20C |
| Shippingconditions | Ambienttemperature |