When citing an article via pandoc-citeproc, I found that Pandoc's method of encoding the URL in the HTML output causes the DOI resolver to fail:

pandoc -t html << EOT
Whitmore, Ian. 1999. ‘Terminologia Anatomica: New Terminology for the
New Anatomist’. *The Anatomical Record* 257 (2): 50–53.
doi:[10.1002/(sici)1097-0185(19990415)257:2\<50::aid-ar4\>3.3.co;2-n](http://
dx.doi.org/10.1002/(sici)1097-0185(19990415)257:2<50::aid-ar4>3.3.co;2-n).
EOT

Following Pandoc's output results in an error:

http://dx.doi.org/10.1002/(sici)1097-0185(19990415)257:2<50::aid-ar4>3.3.co;2-n

Following the URL as it appears in the Markdown does not result in any problems; alternatively, Zotero does it like this:

http://dx.doi.org/10.1002%2F(sici)1097-0185(19990415)257%3A2%3C50%3A%3Aaid-ar4%3E3.3.co%3B2-n

Thanks for the hint about encoding! This problem can also be mitigated by shortening the DOI. However, should this be reported to Zotero or other reference managers, so they do the correct encoding during im- or export?

2 opinions in favour of doing the encoding only, when DOIs are actually converted into URL/Is, over there.