How do I import UMD in ESM?

I have a UMD library and the following works in commonjs...

global.window = global;
var DoSomething = require("../dist/sce-umd.js").DoSomething;
(function(){
    var instance = new DoSomething();
    instance.doSomethingElse();
})()

I am trying to do the same thing with ESM like...

(()=>{
    // Needed for UMD
    global.window = global;
    import("../dist/sce-umd.js").then((OtherThing)=>{

        console.log("This is the next level");
        const other = new OtherThing();
        other.doSomethingElse();
    });
})();

But I get...

TypeError: OtherThing is not a constructor

I also tried new OtherThing.DoSomething() but I get...

TypeError: OtherThing.DoSomething is not a constructor