\frac{dx_{1}}{dt} = \left(-1 \cdot k_{14} \cdot k_{4} \cdot \left(\exp\left(\left(-k_{13}\right) \cdot t\right) \cdot k_{9} + \left(1 - \exp\left(\left(-k_{13}\right) \cdot t\right)\right) \cdot k_{11} + \exp\left(\left(-k_{13}\right) \cdot t\right) \cdot k_{10} + \left(1 - \exp\left(\left(-k_{13}\right) \cdot t\right)\right) \cdot k_{12}\right) / 2 \cdot x_{1} \cdot x_{3} / x_{5} + 1 \cdot k_{14} \cdot k_{2} \cdot x_{4}\right) / k_{14}\\
\frac{dx_{2}}{dt} = \left(1 \cdot k_{14} \cdot k_{4} \cdot \left(\exp\left(\left(-k_{13}\right) \cdot t\right) \cdot k_{9} + \left(1 - \exp\left(\left(-k_{13}\right) \cdot t\right)\right) \cdot k_{11} + \exp\left(\left(-k_{13}\right) \cdot t\right) \cdot k_{10} + \left(1 - \exp\left(\left(-k_{13}\right) \cdot t\right)\right) \cdot k_{12}\right) / 2 \cdot x_{1} \cdot x_{3} / x_{5} + -1 \cdot k_{14} \cdot k_{3} \cdot x_{2}\right) / k_{14}\\
\frac{dx_{3}}{dt} = \left(1 \cdot k_{14} \cdot k_{3} \cdot x_{2} + -1 \cdot k_{14} \cdot k_{4} \cdot x_{3}\right) / k_{14}\\
\frac{dx_{4}}{dt} = \left(1 \cdot k_{14} \cdot k_{4} \cdot x_{3} + -1 \cdot k_{14} \cdot k_{2} \cdot x_{4}\right) / k_{14}\\
\frac{dx_{5}}{dt} = 0 / k_{14}