Sequence in Krebs cycle is
α- Ketoglutaric acid → Isocitric acid → Oxalosuccinic acid
Isocitric acid → Oxalosuccinic acid → α- Ketoglutaric acid
Isocitric acid → α- Ketoglutaric acid → Oxalosuccinic acid
Oxalosuccinic acid → Isocitric acid → α- Ketoglutaric acid