Ryoo prayed to the Kanzeon Bosatsu (the Buddhist Goddess of Mercy) in Asakusa, drew a kuji (a thin strip of bamboo upon which written words or symbols to foretell success or luck) three times, and named the drug "Kintaien."
そして、了翁は、浅草の観世音菩薩に祈念し、籤を3度ひいて「錦袋円（きんたいえん）」と名づけた。