1. Man-made cellulose fibres (including viscose, lyocell, acetate, cupro, triacetate

Fibres cellulosiques artificielles (viscose, lyocell, acétate, cupro et triacétate

2. Man-made cellulose fibres (including viscose, lyocell, acetate, cupro, triacetate)

Fibres cellulosiques artificielles (viscose, lyocell, acétate, cupro et triacétate)

3. The structure of the lichen pigment rhodocladonic acid, 2-acetyl-3,4,6-trihydroxy-7-methoxynaphtho[2,3-b]furan-5,8-dione (1a), has been assigned on the basis of an X-ray crystal structure analysis of its triacetate (1c).

On a déterminé la structure du pigment du lichen: l'acide rhodocladonique, acétyle-2 trihydroxy-3,4,6 méthoxy-7 naphto[2,3-b] furannedione-5,8 (1a) en analysant la structure du cristal de son triacétate (1c) par cristallographie de rayons-X.