C# - How to Get Access Modifiers of a Class Declaration Given an Object with Reflection

Let's say I have a class that's declared

internal sealed class Foo : Bar { /* banana banana banana */ }

And I want to have something like this:

public abstract class Bar {
    protected Bar() {
        if (!this.classDeclarationHasInternalAccess())
            throw new Exception("Declare your class with internal access!");
    }
}

Would this be possible at all?