1-Thia-4,8-diazaspiro(4.5)decan-3-one, 8-((2,3-dihydro-1,4-benzodioxin-2-yl)methyl)-2-methyl-,(Z)-2-butenedioate (1:1) 24868-65-3 8-(1,4-Benzodioxan-2-ylmethyl)-2-methyl-3-oxo-1-thia-4,8-diazaspiro(4.5)decane maleate