OOOSOOOHOHSOOSOHOOHOHOOSOHOHOOHOHOOHOOHOHOOSOHOHOHO-O-OO-OO-OOSOO-Na+Na+Na+Na+Na+O-ONa+OHOSNa+OOOSOOOHOHOOSOHOOHOHOOSOHOHOOHOHOOHOOHOHOOSOHOHOHO-O-OOSNa+Na+O-ONa+OHOSOO-Na+SOO-SSSSOO-O-Na+Na+O-OONa+