<Substance xmlns="http://hl7.org/fhir"><id value="f204"/><identifier><system value="http://acme.org/identifiers/substances/lot"/><value value="AB94687"/></identifier><category><coding><system value="http://terminology.hl7.org/CodeSystem/substance-category"/><code value="chemical"/><display value="Chemical"/></coding></category><code><concept><coding><system value="http://snomed.info/sct"/><code value="333346007"/><display value="Silver nitrate 200 mg/mL cutaneous solution"/></coding></concept></code><description value="Solution for silver nitrate stain"/><expiry value="2018-01-01"/><quantity><value value="100"/><unit value="mL"/><system value="http://unitsofmeasure.org"/><code value="mL"/></quantity></Substance>