Which species of cinchona contains highest percentage alkaloid

alkaloids found in isomer form:

Which of the following is the skeleton of cinchona alkaloid:

cinchonism is:

Thalleioquin Test: Add to 2-3 ml of a weakly acidic solution of a quinine salt a few drops of bromine-water followed by .....ml of strong ammonia

Thalleioquin Test

When these symptoms are produced as the result of continuous use of cinchona or of quinine the condition has been called