Menthol was obtained from lemon eucalyptus oil via cyclization and catalytic hydrogenation .
以柠檬桉叶油为主要原料经环化、催化氢化二步反应得到薄荷醇。
Using acyclovir as raw material , two novel tricyclic derivatives of guanine analogue were synthesized through the reaction of cyclization , esterification and alkylation .