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Metal-Oxygen-non-Metal Li, Be – O– BH2, BF2, CH3
Li, Na,K-O-BH2 Li, Na,K-O-BF2
H-Be, Mg,Ca-O-BH2 H-Be, Mg,Ca-O-CH3
non-Metal-O-Metal-O-non-Metal (H3C-O-Be, Mg, Ca-O-CH3)
(H2B-O-Be, Mg, Ca-O-BH2) (F2B-O-Be, Mg, Ca-O-BF2)
non-Metal-O-non-Metal (H2B, H3C, H2N, HO, F, Ne-O-BH2, CH3, OH, F, Ne)