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Yohko Sakamoto; Tomoko Ishii; Isao Oonishi; Taichi Ohmoto. (1991). Conformational analysis of Ramipril (HOE 498) in a solution by NMR. , 245(3-4), 379–389. doi:10.1016/0022-2860(91)87112-u 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research