1 QR1 {3-[(3ar,4s,5s,6ar)-5-azaniumyl-5-carboxyoctahydrocyclopenta[C]pyrrol-2-ium-4-yl]propyl}(trihydroxy)borate(1-) 1.000 2 QRJ {3-[(5r,7s,8s)-8-azaniumyl-8-carboxy-2-azaspiro[4.4]nonan-2-ium-7-yl]propyl}(trihydroxy)borate(1-) 0.857 3 QR4 {3-[(3ar,4r,5s,6ar)-4-azaniumyl-4-carboxyoctahydrocyclopenta[B]pyrrol-1-ium-5-yl]propyl}(trihydroxy)borate(1-) 0.810 4 QRA 3-[(5~{S},7~{S},8~{S})-8-azanyl-8-carboxy-1-azaspiro[4.4]nonan-7-yl]propyl-$L^{3}-oxidanyl-bis(oxidanyl)boranuide 0.773 5 HE8 3-[(3~{S},4~{R})-4-azanyl-4-carboxy-pyrrolidin-3-yl]propyl-tris(oxidanyl)boranuide 0.750 6 XFP 3-[(2~{S},3~{R})-2-carboxypiperidin-3-yl]propyl-$L^{3}-oxidanyl-bis(oxidanyl)boranuide 0.750 7 VUV 3-[(2~{S},3~{R})-2-carboxypyrrolidin-3-yl]propyl-$L^{3}-oxidanyl-bis(oxidanyl)boranuide 0.700