(top) A plot of the ellipticity at 519 nm as a function of ee with 1mM Fe(II), 2mM 4, and 3mM, 4mM, and 5mM of MBI (derived from MBA) in acetonitrile in a 0.1cm cell. (bottom) A plot of the ellipticity at 525 nm as a function of ee with 1mM Fe(II), 2mM 4, and 6mM, 7mM, 8mM, and 9mM of CEI (derived from CEA) in acetonitrile in a 0.1cm cell.