Cannot empty trash of a stubborn item

Cannot empty trash of a stubborn item.

My trash is completely empty except for a folder “MSU” that contains another folder “Acute calcific periarthritis␀” that contains an image “1009964.jpg”.

First, the basics: “Finder>Empty Trash”:

“The operation can’t be completed because an unexpected error occurred (error code -50).”

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“The operation can’t be completed because an unexpected error occurred (error code -50).”

Continue

“The operation can’t be completed because the item “MSU” is in use.

So then I try the terminal:

[mycomputername:~] myusername% sudo rm -R /Users/myusername/.Trash/MSU

rm: /Users/myusername/.Trash/MSU/Acute calcific periarthritis␀/1009964.jpg: Invalid argument

rm: /Users/myusername/.Trash/MSU/Acute calcific periarthritis␀: Invalid argument

rm: /Users/myusername/.Trash/MSU: Directory not empty

Guessing the problem is the weird character at the end of the name of the folder, “Acute calcific periarthritis␀” I try to rename that folder “xxx”.

“The name “xxx” can’t be used. Try using a name with fewer characters, or with no punctuation marks.

I guess one option is to just leave this single folder “MSU” in my trash can forever, with its contained folder “Acute calcific periarthritis␀” and thats contained 100kb image “1009964.jpg”.

But it’s kind of irritating and I’d like to learn how to fix this.

Any thoughts would be greatly appreciated! Thank you very much.

PS I’ve totally restarted my 10.11.6 iMac Late 2014 multiple times and retried the above to no avail.