test
node1
GO:0008150
biological_process
node2
GO:0050896
response to stimulus
node1->node2
node3
GO:0042221
response to chemical
node2->node3
node6
GO:0010033
response to organic
substance
node3->node6
node4
BFO:0000003
occurrent
node4->node4
node5
BFO:0000015
process
node4->node5
node5->node1
node7
GO:0014070
response to organic
cyclic compound
node6->node7
node8
GO:1901423
response to benzene
node7->node8
node9
BFO:0000001
entity
node9->node4