<prompt> Vitamin D analogue calcitriol is useful in the treatment of:Lichen planusPsoriasisPemphigusLeprosy  <response>: Vitamin D3 analogues - Naturally occurring, active metabolite of vit.D3 - 1,25-Dihydroxyvitamin D3 calcitriol 3 synthetic analogues: -calcipotriol -1,24-Dihydroxyvitamin D3 Tacalcitol and -1,25-Dihydroxyvitamin D3 Maxacalcitol, effective when applied topically in Psoriasis 