OOOSOOOHOHSOOSOHOOHOHOOSOHOHOOHOHOHOOOHOHOOSOHOHOHO-O-OOOO--OOSOO-Na+Na+Na+Na+Na+O-ONa+OHOSNa+OOOSOOOHOHOOSOHOOHOHOOSOHOHOOHOHOHOOOHOHOOSOHOHOHO-O-OOSNa+Na+O-ONa+OHOSO-ONa+SOO-SOO-SOO-OO-Na+Na+Na+