I wanted to write a comment, but apparently you need 50 reputation for that. Sorry for the (almost) duplicate.

I was happy to find my question has been asked and answered on this site. I was less happy to find out that I couldn't replicate the result.

I also have a follow up question: in my case there is a non-standard plural (my longer acro is high resolution computed tomography). How can something like this be modified to support that?

\documentclass[paper=a4, fontsize=12pt]{article}
\usepackage[english]{babel} % English language/hyphenation
\usepackage[pdftex]{graphicx}% Enable pdflatex

   \expandafter\ifx\csname ac@#1\endcsname\AC@used

\acro{CME}{Coronal Mass Ejection}
\acro{ICME}{Interplanetary \acx{CME}}


The \ac{ICME} is a version of \ac{CME}.


A version of \ac{CME} is called \ac{ICME}.


still resulted in the following output:

The Interplanetary Coronal Mass Ejection (ICME) is a version of Coronal Mass Ejection (CME). A version of Coronal Mass Ejection (CME) is called Interplanetary Coronal Mass Ejection (ICME)

I'm using ShareLaTeX, but I have the same result on TexMaker+MikTeX. Is there something I'm missing? How can I get the result I want?

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