Refund on inverted duty structure

Bollarapu (Others) (22 Points)

18 March 2020  
Dear Sir,
A company is getting imported certain goods @ 18% IGST along with custom duty and its customers mainly include research organizations for whom GST payable is @ 5% GST(since research organizations receive exemption). is it eligible to claim refund ITC under RCM?Any circular or notification
plz update sir..