SHisalinearmacromoleculeinwhiche candissociateananioninaqueoussol ﹒ Anionsofequivalentspacedistancer。SothatSHmoleculesappeartobesomer ﹒ TheintermoleculesofSHcanpene trateandwindeachothertoformacont whenSHreachesacertainconcentrati ﹒ Thereleaseofdrugwillbe ......