Diterpenoids Including a Novel Dimeric Conjugate from Salvia leriaefolia - Choudhary, Muhammad Iqbal; Hussain, Amjad; Ali, Zulfiqar; Adhikari, Achyut; Sattar, Samina A.; Ayatollahi, Syed A. Majid; Al-Majid, Abdullah M. A.; Atta-ur-Rahman (Planta Medica, 2012)