Methane ion, ID: C20741882 NIST 24031902322D 1 1.00000 0.00000 Copyright by the U.S. Sec. Commerce on behalf of U.S.A. All rights reserved. 1 0 0 0 0 2 V2000 0.0000 0.0000 0.0000 C 0 5 0 0 0 0 0 0 0 M CHG 1 1 -1 M END