10-Hydroxy-8-pentyl-3-phenyl-1,2,3,4-tetrahydro-5H-phosphinino(3,4-c)chromen-5-one 3-oxide;10-Hydroxy-8-pentyl-3-phenyl-1,2,3,4-tetrahydro-5H-phosphinino[3,4-c]chromen-5-one 3-oxide
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