How do I get a Player's group rank and compare it?

What I would like to do is find if the player in which clicked the button is in the group AND is higher than a certain rank id. I just cant do the Rank ID part. Any ideas of fixing the following bracketed section?

local a = script.Parent.Parent.Play.Anthem

function OnClicked(player)
    if player:IsInGroup(1152346) and[ player:GetRoleInGroup(1152346) >= 50 ]then
    a:Stop()
    wait()
    end
end

script.Parent.ClickDetector.MouseClick:connect(OnClicked)