/usr/share/mimelnk/chemical/x-ncbi-asn1.desktop is in chemical-mime-data 0.1.94-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Encoding=UTF-8
Type=MimeType
MimeType=chemical/x-ncbi-asn1
Comment=PubChem ASN.1 ASCII Format
Comment[de]=Natives PubChem ASN.1 ASCII Format
Icon=chemistry
Patterns=*.asn;
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