19680
One of the earliest reported syntheses of this quinolinic acid was by Zdenko Hans Skraup , who found that methyl-substituted quinolines could be oxidized to quinolinic acid by potassium permanganate .
 Zdenko Hans Skraup
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Zdenko Hans Skraup