Dear maintainer,

I see that the package chemical-structures (version 2.2.dfsg.0-20)
recommends iceweasel or iceape which are not in unstable.

This can be seen in https://packages.debian.org/unstable/chemical-structures

Should it be dropped or changed?

I haven't checked how chemical-structures tried to use iceweasel
(perhaps by launching it by name "icewasel"?). If it's a Debian specific
code what I have done is to recommend "sensible-utils" and then use
"sensible-browser". If it comes from upstream maybe firefox-esr is
better, etc.

Thank you,