marvin: init at 19.1.0 Also adding myself (fusion809) as a maintainer. The marvin Nix file in this commit is largely thanks to @msteen.

maintainers/maintainer-list.nix

···
     email = "[e-mail]";
     name = "Edward O'Callaghan";
   };
+  fusion809 = {
+    email = "[e-mail]";
+    github = "fusion809";
+    name = "Brenton Horne";
+  };
   fuuzetsu = {
     email = "[e-mail]";
     github = "fuuzetsu";

pkgs/applications/science/chemistry/marvin/LicenseManager.desktop

···
+#!/usr/bin/env xdg-open
+[Desktop Entry]
+Type=Application
+Name=ChemAxon License Manager
+Exec=@out@/bin/LicenseManager
+Icon=LicenseManager
+Categories=Education;Science;Chemistry;
+StartupWMClass=com-install4j-runtime-launcher-UnixLauncher
+Comment=License manager for ChemAxon software like MarvinSketch

pkgs/applications/science/chemistry/marvin/MarvinSketch.desktop

···
+#!/usr/bin/env xdg-open
+[Desktop Entry]
+Type=Application
+Name=MarvinSketch
+Exec=@out@/bin/msketch %f
+Icon=MarvinSketch
+MimeType=text/xml;text/plain;chemical/x-cml;chemical/x-mdl-molfile;chemical/x-mdl-sdfile;chemical/x-mol2;chemical/x-pdb;chemical/x-xyz;chemical/x-mdl-rdfile;chemical/x-mdl-rxnfile;chemical/x-inchi;
+Categories=Education;Science;Chemistry;
+StartupWMClass=com-install4j-runtime-launcher-UnixLauncher
+Comment=Molecular modelling, analysis and structure drawing program

pkgs/applications/science/chemistry/marvin/MarvinView.desktop

···
+#!/usr/bin/env xdg-open
+[Desktop Entry]
+Type=Application
+Name=MarvinView
+Exec=@out@/bin/mview %f
+Icon=MarvinView
+Comment=Molecule viewing program
+MimeType=text/xml;text/plain;chemical/x-cml;chemical/x-mdl-molfile;chemical/x-mdl-sdfile;chemical/x-mol2;chemical/x-pdb;chemical/x-xyz;chemical/x-mdl-rdfile;chemical/x-mdl-rxnfile;chemical/x-inchi;
+Categories=Education;Science;Chemistry;
+StartupWMClass=com-install4j-runtime-launcher-UnixLauncher

pkgs/applications/science/chemistry/marvin/default.nix

···
+{ stdenv, fetchurl, dpkg, makeWrapper, coreutils, gawk, gnugrep, gnused, jre }:
+
+with stdenv.lib;
+
+stdenv.mkDerivation rec {
+  name = "${pname}-${version}";
+  pname = "marvin";
+  version = "19.1.0";
+
+  src = fetchurl {
+    name = "marvin-${version}.deb";
+    url = "http://dl.chemaxon.com/marvin/${version}/marvin_linux_${versions.majorMinor version}.deb";
+    sha256 = "1ccsimfvms5q4prjyk6sg5hsc3hkcjjfq3gl7jjm8dgd2173zzyc";
+  };
+
+  nativeBuildInputs = [ dpkg makeWrapper ];
+
+  unpackPhase = ''
+    dpkg-deb -x $src opt
+  '';
+
+  installPhase = ''
+    wrapBin() {
+      makeWrapper $1 $out/bin/$(basename $1) \
+        --set INSTALL4J_JAVA_HOME "${jre}" \
+        --prefix PATH : ${makeBinPath [ coreutils gawk gnugrep gnused ]}
+    }
+    cp -r opt $out
+    mkdir -p $out/bin $out/share/pixmaps $out/share/applications
+    for name in LicenseManager MarvinSketch MarvinView; do
+      wrapBin $out/opt/chemaxon/marvinsuite/$name
+      ln -s {$out/opt/chemaxon/marvinsuite/.install4j,$out/share/pixmaps}/$name.png
+    done
+    for name in cxcalc cxtrain evaluate molconvert mview msketch; do
+      wrapBin $out/opt/chemaxon/marvinsuite/bin/$name
+    done
+    ${concatStrings (map (name: ''
+      substitute ${./. + "/${name}.desktop"} $out/share/applications/${name}.desktop --subst-var out
+    '') [ "LicenseManager" "MarvinSketch" "MarvinView" ])}
+  '';
+
+  meta = {
+    description = "A chemical modelling, analysis and structure drawing program";
+    homepage = https://chemaxon.com/products/marvin;
+    maintainers = with maintainers; [ fusion809 ];
+    license = licenses.unfree;
+    platforms = platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

···
 
   jmol = callPackage ../applications/science/chemistry/jmol { };
 
+  marvin = callPackage ../applications/science/chemistry/marvin { };
+
   molden = callPackage ../applications/science/chemistry/molden { };
 
   octopus = callPackage ../applications/science/chemistry/octopus { openblas=openblasCompat; };