test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node9
GO:0008150
biological_process
node2->node9
node3
GO:0071704
organic substance
metabolic process
node4
GO:1901564
organonitrogen
compound metabolic
process
node3->node4
node5
GO:0009820
alkaloid metabolic
process
node4->node5
node6
GO:0035834
indole alkaloid
metabolic process
node5->node6
node7
GO:0008152
metabolic process
node7->node3
node8
GO:0006807
nitrogen compound
metabolic process
node7->node8
node8->node4
node9->node7
node10
BFO:0000001
entity
node10->node1