*3.3.2.1.2. Drechmeria sp.: a rich source of indole diterpenes*

An endophytic fungi *Drechmeria* sp. was found to be the reservoir of diverse indole diterpenes including drechmerin A (38), drechmerin B (39), drechmerin C (40), drechmerin D (41),

**Figure 15.** Indole diterpenes from *A. nidulans* [98].

**Carbon Number** **Compound 36g 37g 38c 39c 40c 41c 42c 43c 44c**

Diterpenes from Different Fungal Sources and Their 13C-NMR Data

http://dx.doi.org/10.5772/intechopen.79186

 152.2 151.3 152.6 152.2 152.3 153.8 153.8 153.5 150.7 116.7 116.4 54.7 53.8 53.9 52.1 52.1 51.8 51.9 132.7 131.0 41.1 40.9 40.9 43.9 43.9 43.7 46.6 123.4 125.9 34.0 34.1 34.1 27.5 27.5 27.4 33.2 122.6 118.9 26.5 26.4 26.5 29.8 29.8 29.5 32.3 110.4 110.3 79.3 77.7 77.9 73.1 73.1 73.0 84.5 120.3 121.1 \*\*\* \*\*\* \*\*\* \*\*\* \*\*\* \*\*\* \*\*\* 138.5 138.9 80.6 79.9 78.4 72.7 42.7 77.7 88.6 33.7 37.1 31.0 32.5 32.7 72.9 72.7 68.7 74.1 148.7 150.0 71.1 68.3 68.5 61.4 61.4 65.0 175.8 45.4 45.7 42.0 53.6 53.6 68.9 69.0 70.7 212.8 23.9 24.0 39.2 41.6 41.6 78.8 78.9 78.6 52.2 52.9 53.0 22.9 24.9 24.8 30.6 30.6 30.8 23.8 80.3 80.4 25.7 26.3 26.3 22.0 22.0 22.0 24.7 74.6 74.6 50.4 50.5 50.5 51.6 51.6 51.7 50.5 28.6 28.4 28.4 28.2 28.3 30.7 28.2 79.5 79.8 118.0 118.1 118.1 117.2 117.3 116.7 118.3 86.9 87.0 126.4 126.4 126.4 126.5 126.5 126.4 126.3 27.7 27.7 118.8 118.9 118.9 118.9 118.9 131.7 119.0 23.4 23.4 119.8 119.8 119.8 119.8 119.8 121.0 120. 75.9 76.0 120.8 120.9 120.9 120.8 120.8 121.0 121.2 64.8 64.8 112.8 112.8 112.8 112.7 112.7 110.8 112.8 60.0 60.0 142.2 142.2 142.2 141.9 141.9 142.0 142.2 64.7 64.7 15.0 15.0 15.0 16.6 16.6 16.5 15.0 73.0 73.0 20.4 17.0 17.1 19.1 19.1 19.0 16.4 \*\*\* \*\*\* 14.1 178.2 178.2 \*\*\* \*\*\* \*\*\* \*\*\* 69.7 69.8 73.0 72.8 77.7 76.2 76.1 73.7 16.4 29.0 29.0 25.5 26.4 23.7 28.7 28.8 27.5 84.0 27.9 28.0 25.9 25.5 22.1 17.2 17.1 25.2 27.8 **1'** 42.8 42.8 60.1 95.5 96.0 36.4 22.9

**2'** 53.8 53.9 123.7 77.5 77.6 78.4 **3'** 106.8 105.3 136.3 77.9 77.8 79.0 **4'** 19.3 19.3 18.2 22.6 22.4 22.0

**Figure 16.** Indole diterpenes from (1–11) *Drechmeria* sp. [99].

drechmerin E (42), drechmerin F (43), drechmerin G (44), terpendole A (45), terpendole C (46), terpendole I (47), and dehydroxypaxilline (48) [99] (**Figure 16**).

The 13C-NMR spectrum of drechmerin exhibited 28 carbon resonances, comprising 8 aromatic carbons, 4 oxygenated carbons, 6 methylene carbons, 2 methine carbons, 3 quaternary carbons, and 5 methyl carbons [100]. The detail of 13C-NMR data is given in **Table 3**.
