Consider the following array:

```
[
  { url: "https://url.com/file1", md5: "fbbbabcc19264ce7b376ce4c726b9b85" },
  { url: "https://url.com/file2", md5: "d920d140432b961f07695ec34bd2a8ad" },
  { url: "https://url.com/file3", md5: "fbbbabcc19264ce7b376ce4c726b9b85" },
  { url: "https://url.com/file4", md5: "bf80655dbe90123324f88a778efa39f7" },
  { url: "https://url.com/file5", md5: "fbbbabcc19264ce7b376ce4c726b9b85" }
];

```

The files "file1", "file3", and "file5" have the same content and therefore the same md5. I only want to keep the files with different md5s (file1, file2, file4). 

What are the possible ways to achieve this with modern ES6?