5RNT:
reference: X-ray analysis of cubic crystals of the complex formed between ribonuclease T1 and guanosine-3',5'-bisphosphate., Lenz A, Heinemann U, Maslowska M, Saenger W, Acta Crystallogr B 1991 Aug 1;47 ( Pt 4):521-7. PMID: 1930833

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