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![not vi» t c ' c+ ï ls r,*;n i . Î . . his is a projection along the \ axis and. -perpendicular to the ©crew axis (the z axis), which runs) vertically. The easiest way to visualioo the structure le to look et one of tho residuos at the bottom of the if i ♦ -<->, Mo t - s t t l r< to group is inclined t about 35 ô to the fibre axis, *:m3 hug; it® plane perpendicular to that of the paper* There is thus an infinite ©eue,iene© of ny.iropen beads running fron» one cell to the next, -rpendicular to the paper and joining residues of adjacent chains* It follows that the tonus of thee®-residues all lie on an inclined lathe. There is another set of such lathes at a level ..I I hi? her in the structure, but due to the 120° rotation of the screw axis th< se lut he s run at an an,-le to the paper, A further »1 S higher there is a third set of lathes, again at an un. le te the «aper. Above that the structure repeats. The foi mal crystallo- raphic description of the structure is: e « ■' » E, c « 9*3 1, op'.'Cf. .-. roup P^U, one residue -er sy •* trie unit. Calculate.] Jensit.v 1#!? en/ce. o -served ^ 1 » 11 ^ ftn/ee, (It is often found for t-ie type of re t erial that trie ce ulated ene It i .»i d ¡? í ■> i erve d») The co-o'- Instes of the stops of ore osynmetrlc unit (excepting hy J roe-en atom«) are •• ivon in Tabic I, t 0 the nearest 0*0'. % , In 'building the structure we have shop ted the standard Paulin/ -Corey* hood .-istances and anrles* The hydrogen bond distance (ni+ros-en to o.e: en) is >, /'6 I, which is a little short, % but luite acceptable, r .1 1 f tr > t., es](https://iiif.wellcomecollection.org/image/b18175648_PP_CRI_H_1_41_1_0003.jp2/full/800%2C/0/default.jpg)
