diff --git a/manifests/c/ChemAxon/markusheditor/21.3/ChemAxon.markusheditor.yaml b/manifests/c/ChemAxon/markusheditor/21.3/ChemAxon.markusheditor.yaml
deleted file mode 100644
index 9336a6418..000000000
--- a/manifests/c/ChemAxon/markusheditor/21.3/ChemAxon.markusheditor.yaml
+++ /dev/null
@@ -1,39 +0,0 @@
-PackageIdentifier: ChemAxon.markusheditor
-PackageName: Markush Editor
-Publisher: ChemAxon
-Author: ChemAxon
-ShortDescription: ChemAxon.markusheditor
-Description: Creating a patent claim that covers all of the desired compounds, without any overlap with prior-art documents, can be a challenging task and a huge responsibility. Markush Editor assists you in all the steps of the drafting process, saves time and effort, and helps create strong, high-quality claims.
-Tags:
-- chemistry
-- organic chemistry
-- molecule
-- java
-- jchem
-- research
-- patent
-FileExtensions:
-- mrv
-- cxsmi
-- cxsmiles
-- cxsma
-- cxsmarts
-- abbrevgroup
-- csmol
-- csrxn
-- cssdf
-- t
-- csrdf
-- mol
-PackageUrl: https://chemaxon.com/products/markush-editor
-License: Copyright (c) Chemaxon
-LicenseUrl: https://docs.chemaxon.com/display/docs/End+User+License+Agreement
-PackageVersion: 21.3
-InstallerType: msi
-Installers:
-- Architecture: x64
-  InstallerUrl: https://dl.chemaxon.com/markush/21.3.0/markush-editor_windows-x64_21.3.msi
-  InstallerSha256: e9ef87b0b70481e047cee167ce03ecc742573722a90b1d08017e48a6922bce3f
-PackageLocale: en-US
-ManifestType: singleton
-ManifestVersion: 1.0.0