RIFM fragrance ingredient safety assessment, 4-methyl-1-oxaspiro[5.5]undecene, CAS Registry Number 68228-06-8. (December 2019) - Api, A.M.; Belmonte, F.; Belsito, D.; Biserta, S.; Botelho, D.; Bruze, M.; Burton, G.A.; Buschmann, J.; Cancellieri, M.A.; Dagli, M.L.; Date, M.; Dekant, W.; et al.