I want Protégé to infer that a certain class (or individual) is equivalent to another class if it has specific properties.

The following is a minimal snippet showing the issue. I expect the reasoner to figure out that VaccinesCauseAutism is a type of MedicalConspiracyTheory.

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .

:involves rdf:type rdf:ObjectProperty . 
:Medicine rdf:type owl:Class .
:SecretPlan rdf:type owl:Class .

:MedicalConspiracyTheory a owl:Class ;
  rdfs:label "Medical Conspiracy Theory" ;
  owl:equivalentClass [ 
    rdf:type owl:Restriction ;
    owl:onProperty :involves ;
    owl:someValuesFrom [
      rdf:type owl:Class ;
      owl:intersectionOf ( :SecretPlan :Medicine )
    ]
  ] .

:VaccinesCauseAutism a owl:Class;
  rdfs:label "Vaccines Cause Autism" ;
  :involves :SecretPlan, :Medicine .

What am I doing wrong here?