(untitled) - Aboelella, N W; Kryatov, S V; Gherman, B F; Brennessel, W W; Young, V G; Sarangi, R; Rybak-Akimova, E V; Hodgson, K O; Hedman, B; Solomon, E I; Cramer, C J; Tolman, W B (J. Am. Chem. Soc., 2004)