That which is claimed is:
1. Hypromellose acetate succinate having a ratio of 2-position MS to 3-position MS of 1.2 or less, wherein the 2-position MS means a molar substitution of hydroxypropyl group by which a hydrogen atom of a hydroxyl group on 2-position carbon of each glucose unit of the hypromellose acetate succinate has...
This application claims priority from Japanese Patent Application No. 2016-048254, filed Mar. 11, 2016, the disclosure of which is incorporated by reference herein in its entirety.