Metformin-based copper(II) complexes: synthesis, structural characterization and mimicking activity of catechol oxidase and phenoxazinone synthase. - Ramadan, Abd El-Motaleb M.; Shaban, Shaban Y.; Ibrahim, Mohamed M.; Sallam, Shehab A.; El-Shami, Fawzya I.; Al-Juaid, Saleh (Journal of Materials Science, 2020)