“…Ring conformation: Pyranose systems may present at least eight relevant conformers in solution 1,2,18,20,[41][42][43][44] (which are most easily distinguished geometrically by means of appropriate pseudorotation variables 20,[45][46][47][48][49][50][51][52][53], namely two chair forms (originally labelled C1 and 1C or, more recently, 4 C 1 and 1 C 4 ) and six boat forms (labelled 1,4 B, 2,5 B, 3,0 B, B 1,4 , B 2,5 and B 3,0 ). Skewboat forms may also be of relevance for some systems.…”