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The decays $B^0_s \rightarrow J/\psi \pi^+\pi^- K^+ K^-$ are studied using adata set corresponding to an integrated luminosity of 9fb$^{-1}$, collectedwith the LHCb detector in proton-proton collisions at centre-of-mass energiesof 7, 8 and 13TeV. The decays $B^0_s \rightarrow J/\psi K^{\ast0}\bar{K}^{\ast0}$ and $B^0_s \rightarrow \chi_{c1}(3872)K^+K^-$, where the$K^+K^-$ pair does not originate from a $\phi$ meson, are observed for thefirst time. Precise measurements of the ratios of branching fractions betweenintermediate $\chi_{c1}(3872)\phi$, $J/\psi K^{\ast0}\bar{K}^{\ast0}$,$\psi(2S)\phi$ and $\chi_{c1}(3872)K^+K^-$ states are reported. A structure,denoted as $X(4740)$, is observed in the $J/\psi\phi$ mass spectrum and,assuming a Breit-Wigner parameterisation, its mass and width are determined tobe \begin{eqnarray*} m_{X(4740)} & = & 4741 \pm 6 \pm 6\,{\mathrm{MeV}}/c^2 \,,\\ \Gamma_{X(4740)} & = & 53 \pm 15 \pm 11\,{\mathrm{MeV}} \,, \end{eqnarray*}where the first uncertainty is statistical and the second is systematic. Inaddition, the most precise single measurement of the mass of the $B^0_s$ mesonis performed and gives a value of  $$ m_{B^0_s} = 5366.98 \pm 0.07 \pm 0.13\,{\mathrm{MeV}}/c^2\,. $$

Study of $B^0_s \rightarrow J/\psi\pi^+\pi^-K^+K^-$ decays