With an androstane skeleton, including 18- or 19-substituted derivatives, 18-nor derivatives and

Official title: {with an androstane skeleton, including 18- or 19-substituted derivatives, 18-nor derivatives and also derivatives where position 17-beta is substituted by a carbon atom not directly bonded to a further carbon atom and not being part of an amide group}

C07J41/0038 (With an androstane skeleton, including 18- or 19-substituted derivatives, 18-nor derivatives and) appears on 103 US grants and 56 published applications in this corpus.