91921-56-1 Insulin (B20-B30) Insulin B (20-30) L-Alanine, N-(N2-(1-(N-(N-(N-(N-(N-(N2-(N-glycyl-L-alpha-glutamyl)-L-arginyl)glycyl)-L-phenylalanyl)-L-phenylalanyl)-L-tyrosyl)-L-threonyl)-L-prolyl)-L-lysyl)-, (3aS-(3aalpha,4beta,6aalpha))-