POTASSIUM ION non-polymer HETAI K 1 1999-07-08 2011-06-04 N REL 39.098 K N N RCSB K K 1 1 N N N 0.000 0.000 0.000 0.000 0.000 0.000 K K 1 [K+] [K+] [K+] [K+] [K+] InChI=1S/K/q+1 NPYPAHLBTDXSSS-UHFFFAOYSA-N potassium potassium(+1) cation RCSB RCSB