In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Mechanochemical Solvent-Free Conditions for the Synthesis of Pillar[5]arene-Containing [2]Rotaxanes, published in 2019, which mentions a compound: 33941-15-0, mainly applied to pillararene diamide rotaxane inclusion preparation mechanochem ball milling, COA of Formula: C12H25NO5.
Pillar[5]arene-containing [2]rotaxanes have been efficiently prepared under solvent-free conditions. Specifically, solid-to-solid ball-milling of primary or secondary amine reagents with the inclusion complex resulting from the association of dodecanedioyl dichloride and a pillar[5]arene derivative provided the corresponding diamide [2]rotaxanes in good to excellent yields. Importantly, [2]rotaxanes difficult or even impossible to prepare under classical reaction conditions in solution, are now easily obtained.
In some applications, this compound(33941-15-0)COA of Formula: C12H25NO5 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.
Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem