RU 2496866 C1. Ivshina I.B., Vikhareva E.V., Richkova M.I., Mukhutdinova A.N., Karpenko J.N. Method of biodegradation of drotaverine hydrochloride. Application: 2012120923/10, 23.05.2012. Effective date for property rights: 23.05.2012. Date of filing: 23.05.2012. Date of publication: 27.10.2013. Bull. 30.