Viscose is a fiber made from regenerated wood cellulose. Viscose is structurally similar to cotton, which is almost pure cellulose. Cellulose is a linear polymer of glucose units with the empirical formula. To prepare viscose, the cellulose is treated with sodium hydroxide to form "alkali cellulose,". The alkali cellulose is then treated with carbon disulfide to form a solution of sodium cellulose xanthate, which is called viscose.