Correlation between structure and electron transfer in organometallic model compound for flavin with \dqButterfly\dq conformation. Journal of Organometallic Chemistry, (456)2:167--173, 1993. [PUMA: conformation;silyldihydropyrazine crystal cyclic deriv;ESR deriv;flavin dihydropyrazine model mol prepn silyldihydropyrazine structure voltammetry]