add schema.org/bioschemas markup to compound cards

ippisite/ippidb/templates/compound_card.html

@@ -468,6 +468,24 @@
 
   </div>
 </div>
+<script id='JSON_LD' type="application/ld+json">
+
+  {
+"url": "{{ compound.get_absolute_url }}",
+"inChI": "{{ compound.inchi }}",
+"iupacName": "{{ compound.iupac_name }}",
+"molecularWeight": {{ compound.molecular_weight }},
+"identifier": "{{ compound.id }}",
+"inChIKey": "{{ compound.inchi }}",
+"@type": "MolecularEntity",
+"image": "https://www.ebi.ac.uk/chembl/api/data/image/CHEMBL3623057.svg",
+"smiles": [
+  "{{ compound.canonical_smile }}"
+],
+"@context": "http://schema.org"
+}
+
+</script>
 <script>
   var showTab = function (hash) {
     window.location.hash = hash;