Beta-carotene is a form of carotene with β-rings at both ends. Its the most common form of carotene. It is a form of Vitamin A.
D: 7-Dehydrocholesterol → Previtamin D3 → Cholecalciferol (D3) → Calcidiol → Calcitriol (active form) → Calcitroic acid; Ergosterol → Ergocalciferol (D2); (analogues: Dihydrotachysterol, Calcipotriol, Tacalcitol)
E: Tocopherol - Tocotrienol