| —— | 
                                        2,2-dimethyl-8-[(pyridin-3-ylmethyl)amino]-1,2,3,4-tetrahydropyrimido[4',5':4,5]furo[2,3-c]isoquinolin-5-ol | 
                                        —— | 
                                        C21H21N5O2 | 
                                        375.43 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        5-methoxy-2,2-dimethyl-N-(pyridin-3-ylmethyl)-1,2,3,4-tetrahydropyrimido[4',5':4,5]furo[2,3-c]isoquinolin-8-amine | 
                                        —— | 
                                        C22H23N5O2 | 
                                        389.457 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        5-methoxy-2,2-dimethyl-1,2,3,4-tetrahydropyrimido[4',5':4,5]furo[2,3-c]isoquinolin-8-ol | 
                                        925214-47-7 | 
                                        C16H17N3O3 | 
                                        299.329 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        8-chloro-2,2-dimethyl-5-methoxy-1,2,3,4-tetrahydropyrimido[4',5':4,5]furo[2,3-c]isoquinoline | 
                                        925214-48-8 | 
                                        C16H16ClN3O2 | 
                                        317.775 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        ethyl 1-amino-5-methoxy-8,8-dimethyl-6,7,8,9-tetrahydrofuro[2,3-c]isoquinoline-2-carboxylate | 
                                        925214-46-6 | 
                                        C17H22N2O4 | 
                                        318.373 |