RDKit 2D 2 0 0 0 0 0 0 0 0 0999 V2000 0.0000 0.0000 0.0000 O 0 0 0 0 0 0 0 0 0 0 0 0 1.0000 0.0000 0.0000 Na 0 0 0 0 0 15 0 0 0 0 0 0 M CHG 2 1 -1 2 1 M END