| 41. | Indole alkaloids are also present in fungi.
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| 42. | In the synthesis of monoterpenoid indole alkaloids, secologanin plays the role of the aldehyde.
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| 43. | Tryptophan in the diet is metabolized by bacteria in the gastrointestinal tract to produce indole.
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| 44. | The amino acid tryptophan is an indole derivative and the precursor of the neurotransmitter serotonin.
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| 45. | Bergman and Venemalm developed a technique for lithiating the 2-position of unsubstituted indole.
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| 46. | Alan Katritzky also developed a technique for lithiating the 2-position of unsubstituted indole.
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| 47. | Leaf extracts and sap contain many insecticidal compounds such as the indole alkaloid aspidophytine.
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| 48. | "' Eburnamine "'is an indole alkaloid in the aspidosperma group.
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| 49. | It is resistant to most common antibiotics and cold temperatures and is oxidase and indole positive.
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| 50. | One nitrogen is part of a rigid ring system and is shielded by the C6 indole.
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