Substituted Methyl 5β-Cholan-24-oates; Part III: Synthesis of a Novel Cholaphane from Ethylene Glycol Diester of Lithocholic Acid by Cyclization with Terephthalic Acid - Kolehmainen, Erkki; Tamminen, Jari; Lappalainen, Kari; Torkkel, Tuire; Seppälä, Raimo (Synthesis, 1996)