1-Thia-4,8-diazaspiro(4.5)decan-3-one, 8-((2,3-dihydro-6-methyl-1,4-benzodioxin-2-yl)methyl)-,(Z)-2-butenedioate (1:1) 24868-67-5 8-(6-Methyl-1,4-benzodioxan-2-ylmethyl)-3-oxo-1-thia-4,8-diazaspiro(4.5)decane maleate