Fun, H., Quah, C. K., Huang, C., & Yu, H. (2011). 5-Meth­oxy-1,2′,3-trimethyl-4,6-dioxa-2-aza­spiro­[bicyclo­[3.2.0]hept-2-ene-7,4′-isoquinoline]-1′,3′(2′H,4′H)-dione. International Union of Crystallography.

Fun, Hoong-Kun, Ching Kheng Quah, Chengmei Huang, and Haitao Yu. 5-Meth­oxy-1,2′,3-trimethyl-4,6-dioxa-2-aza­spiro­[bicyclo­[3.2.0]hept-2-ene-7,4′-isoquinoline]-1′,3′(2′H,4′H)-dione. International Union of Crystallography, 2011.

Fun, Hoong-Kun, Ching Kheng Quah, Chengmei Huang, and Haitao Yu. 5-Meth­oxy-1,2′,3-trimethyl-4,6-dioxa-2-aza­spiro­[bicyclo­[3.2.0]hept-2-ene-7,4′-isoquinoline]-1′,3′(2′H,4′H)-dione. International Union of Crystallography, 2011.